why is the atomic mass of strontium not a whole number
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Why is the atomic mass of an element not whole number? Why is the atomic mass of a element not a whole number like its atomic number and mass number? An element's atomic mass is not an integer (a whole number) because it is the average mass of all of the element's isotopes (elements that have different amounts of neutrons e … ffecting the mass number of an element). For example, oxygen has 16.01 as its atomic mass.
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Introduction A property closely related to an atom’s mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu. Other atoms don’t generally have round-number atomic masses for reasons that are a little beyond the scope of this article. In general, though, an atom's atomic mass will be very close to its mass number, but will have some deviation in the decimal places.
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How to Calculate Atomic Mass One number is carbon's element number or atomic number. Atomic number increase as you go across the table. This is not the value you want. The atomic mass or atomic weight is the decimal number, The number of significant figures varies according to the table, but the value is around 12.01. This value on a periodic table is given in atomic mass units or amu, but for chemistry calculations, you usually write atomic mass in terms of grams per mole or g/mol.
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- Atomic number = (b) Atomic number = (C) 2. a. Mass number = (c) Mass number = 31 b. 7 Number of protons = (a) Number of protons = (a) b. Number of electrons = (b) Number of electrons = (b) c. Number of neutrons = (C) Number of neutrons = 48 4. a. Atomic number = 23 Atomic number = 36 Mass number = 51 Mass number = (c) b. 6. a. 6. Barium4+ 6.
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It's Elemental Two strontium compounds, strontium carbonate (SrCO3) and strontium nitrate (Sr(NO3)2), burn with a bright, red flame and are used in fireworks and signal flares. Strontium carbonate is also used to make certain kinds of glass and is the base material for making most other strontium compounds. Strontium-90, a radioactive isotope of strontium, is a common product of nuclear explosions. It has a half-life of about 28.8 years and decays into yttrium-90 through beta decay. Strontium-90 is especially deadly since it has a relatively long half-life, is strongly radioactive and is absorbed by the body, where it accumulates in the skeletal system.
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- All atoms have a mass number which is derived as follows. Review: 1  An element's or isotope's atomic number tells how many protons are in its atoms.  An element's or isotope's mass number tells how many protons and neutrons in its atoms.
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- The sum of the number of protons and neutrons in the atomic nucleus is called the mass number. For example, Lithium has 3 protons and 4 neutrons in its nucleus.It's mass number is 7 (3+4). The mass number usually goes in front of the atomic symbol and in superscript, such as 7Li.aking the world better, one answer at a time. The sum of the number of protons and neutrons in the atomic nucleus is called the mass number. For example, Lithium has 3 protons and 4 neutrons in its nucleus. It's mass number is 7 (3+4).
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- The atomic number is the number that indicates the number of protons (or electrons) of an element. The atomic mass is on account of the mass of proton and nutron of an atom. The mass of nutron , proton and electrons are 1.67493*10^-(27) 1.67262*10^(-27) kg and 9.10939*10^(-31) kg. The mass of the electron is negligible compared to that of nutron anor proton. The nutron is slightly more mass than that of proton.
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Why atomic mass is not whole numbers? An element's atomic mass is not an integer (a whole number) because it is the average mass of all of the element's isotopes (elements that have different amounts of neutrons e…ffecting the mass number of an element).
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What Is the Difference Between Atomic Number and Mass Number? Quick Answer. The atomic number of an atom is the number of protons that resides in the nucleus, while the mass number is the number of protons and neutrons combined. The atomic number determines the type of element an atom, while the number of neutrons determines the isotope of the element. Many elements naturally occur in the form of several different isotopes.
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- An atom of strontium has a nuclear charge of 38e, that is its nucleus is composed of 38 protons each containing the same (though positive) charge of an electron (electron char…ge = 1e).
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Atomic mass of hydrogen? The mass number is the number of protons added to the number of neutrons. Hydrogen only contains 1 proton and no neutrons, so that gives a mass number of 1. However, there are some isotopes of Hydrogen, in other words, some atoms that have more than zero neutrons. For example, Deuterium has 1 neutrons hence an atomic mass of 2 and Tritium has 2 neutrons hence an atomic mass of 3. The number you see for atomic mass in a periodic table is an average of the abundance of the isotopes, which is why it's a decimal like 1.007941.00794 and not a whole number.
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- Rating Newest Oldest. Best Answer: atomic mass is an average mass of the isotopes, so you won't have an exact number. having an atomic mass of 24.3 means that there are more Mg - 24 atoms than Mg-25 atoms. Source(s): hazeleyed424 · 7 years ago. Thumbs up.
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Why is the periodic table arranged by atomic number and not the atomic mass? the ptof elements is arranged by the atomic number because it is the amount of protons and electrons on the element.`. so, hydrogen has 1 proton, and one electron, that means that its atomic mass is 1. helium otherwise, has 2 protons, 2 electrons and 2 neutrons, and an atomic mass of 4.
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Chemical element Whereas the mass number simply counts the total number of neutrons and protons and is thus a natural (or whole) number, the atomic mass of a single atom is a real number for the mass of a particular isotope of the element, the unit being u.
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Atomic Number and Mass Number Atomic Number (Z) = Number of protons =Number of electrons. For example, an atom of magnesium contains 12 protons, therefore, its atomic number is 12. All the atoms of a particular element contain same number of protons in their nuclei. Therefore, all the atoms of an element have same atomic number.
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Self-Quiz Yes, because the masses are almost the same. No, because calcium had not been discovered in Dalton's time. No, because all calcium atoms have a mass of 40 u. No, because Dalton's theory said that all atoms of a given element were alike in mass. Yes, because these represent two isotopes of calcium.
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- Avogadro's number is 602,214,150,000,000,000,000,000; or 6.0221415 x 1023 This is useful because 1 mole of an element is as many grams as the element's relative atomic mass. So 1 mole of protium is 1.008g and consists of an equivalent number of atoms as Avogadro's number.
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Chemistry chapter 2 The mass number, A, is the sum of the protons and neutrons in the element. The atomic number, Z, is the number of protons only. On the periodic table, elements are arranged by atomic number. In this case we see that Carbon is element 6, and so it had 6 protons.
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- Report Abuse. It's just atomic mass. The number you see on the periodic table is a weighted average of all the isotopes of that element, based on the relative abundance of each isotope. theyuks · 9 years ago. Thumbs up.
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- 6. Subtract the atomic number from the atomic mass. Because electrons have very little mass, the majority of an atom’s mass comes from the protons and neutrons. Since you know the number of protons from the atomic number, you can subtract that from the atomic mass to find the number of neutrons.ocate the element’s atomic number. Atomic number is the number of protons that make up a single atom of that element. The atomic number can be found above the element symbol, in the upper left-hand corner of the square. Protons are positively charged particles in the nucleus of an atom.
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- For instance, to a first approximation, 1 gram of hydrogen element (H), which has a mass number of 1 (atomic number 1), has 7023602200000000000♠6.022×1023 hydrogen atoms. Similarly, 12 grams of 12 C, with the mass number of 12 (atomic number 6), has the same number of carbon atoms, 7023602200000000000♠6.022×1023. Avogadro's number is a dimensionless quantity and has the numerical value of the Avogadro constant given in base units.
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ATOMS Again, mass number and atomic mass are two very different things, that happen to approximately correspond. Mass number is simply the number of nuclear particles (protons and neutrons). Atomic mass is the actual mass of the atom. Keep in mind that protons and neutrons do not have masses of exactly one amu. Even if they did, the mass of the nucleus is not the sum of the masses of the nuclear particles. There is only one isotope of one element for which the mass number and atomic mass are exactly the same. That is carbon-12, and happens because the amu is defined as 1/12 of the mass of a carbon-12 atom.
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- The nucleus of the helium atom contains 2 massive, positively charged particles. Thus, Z, the atomic number = 2. Z is simply the number of protons, massive, positively charged particles, present within the nucleus. Z thus defines the identity of the element: Z=1, hydrogen; Z=2, helium; Z=3, lithium;.................Z=80, mercury. You do not have to remember these numbers, because in every exam you ever sit you should be provided a copy of the Periodic Table, which lists all the elements in order of atomic number.
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Chemestry Chpt 3 As the atomic masses of the elements in the periodic table increases, the number of atoms in 1 mole of neon, a mole of calcium contains remains the same The atomic number of neon is 10. The atomic number of calcium is 20. compared with a mole of neon a mole of calcium contains an equal number of atoms To determine the molar mass of an element, one must know the elements