atomic mass and atomic number

atomic mass and atomic number : The atomic number, Z, should not be confused with the mass number, A, which is the total number of protons and neutrons in the nucleus of an atom. .....   More from Wikipedia

atomic mass and atomic number : The amount that the atomic masses deviate from their mass numbers is as follows: the deviation starts positive at hydrogen-1, becomes negative until a .....   More from Wikipedia

atomic mass and atomic number : Magnesium is the chemical element in the periodic table that has the symbol Mg and atomic number 12 and an atomic mass of 24.31. See also: Health & Medicine Vegetarian Dietary Supplement Plants & Animals Matter & Energy Inorganic Chemistry Chemistry This alkaline earth metal is primarily used as an alloying agent to make aluminium-magnesium alloys, sometimes called "magnalium" or "magnelium". Magnesium, in its purest form, can be compared to aluminium, and is strong and light.. For more information about the topic Magnesium, read the full article at Wikipedia.org, or see the following related articles: Neon — Neon is the chemical element in the periodic table that has the symbol Ne and atomic number 10. A colorless, nearly inert noble gas, neon gives a ...  > read more Indium — Indium is a chemical element in the periodic table that has the symbol In and atomic number 49. This rare, soft, malleable and easily fusible poor ...  > read more Calcium — Calcium is a chemical eleme....   More from Science Daily

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  www.mindbites.com Professor Harman explains isotopes and atomic mass in this lesson covering atomic structure. Most elements exist in nature as more than one isotope. Isotopes are atoms that have the same number of protons as the element but a different number of neutrons. The number of protons always remains the same, as this number (also known as the atomic number) is what determines the element. Prof. Harman also introduces atomic mass units, or amu's, which are a more convenient unit for ...

Question : What is the atomic number and atomic mass number for an isotope of Pm with 89 neutrons. Give two answers: first, the atomic number; then, the atomic mass number.

Answer : Atomic #: 61- {the number of the element (doesn't change with isotopes)} Atomic mass: 150- {the atomic # + the number of neutrons}..   More from Yahoo Answers

Question : When I look at the periodic table most of the elements have an atomic mass number that isnt a whole number. For example hydrogen's atomic mass is 1.00794. Since the atomic number is the number of protons and neutrons in the atoms nucleus, how can an atom have ".00794" of a proton or neutron?

Answer : Atomic mass number is indicating the amu value of the atom of any element. The number is actually the total of numbers of Proton and Neutron it has in its atom. Now number of Proton in a atom for any particular element is fixed but the number of Neutron is not fixed. An element can have different number of neutrons in different atoms of same element which is called Isotopes. The Atomic number we see is addition of number of proton and average of number of neutron. As this average is never a whole number, the atomic number is not a whole number...   More from Yahoo Answers