Cite the difference between atomic mass and atomic weight. #2.2 Chromium has fou

Question

Cite the difference between atomic mass and atomic weight. #2.2 Chromium has four naturally-occurring isotopes: 4.34% of^50 Cr, with an atomic weight of 49.9460 amu, 83.79% of^52Cr, with an atomic weight of 51.9405 amu, 9.50% of^53Cr, with an atomic weight of 52.9407 amu, and 2.37% of^54 Cr, with an atomic weight of 53.9389 amu. On the basis of these data, confirm that the average atomic weight of Cr is 51.9963 amu. #2.5 Relative to electrons and electron states, what does each of the four quantum numbers specify? # 2.11: justify your answer based on the VALENCE of state # 2.18 complete response for full credit 2.19 Compute the percent's ionic character of the interatomic bonds for the following compounds: TiO_2, ZnTe, CsCI, InSb, and MgCl_2. #2.21 how many bonds possible for s and p orbitals? 2.22 What type(s) of bonding would be expected for each of the following materials: brass (a copper-zinc alloy), rubber, barium sulfide (BaS), solid xenon, bronze, nylon, and aluminum phosphide (A1P)?

Explanation / Answer

Answer 1:

Atomic Mass

Atoms are mainly composed of protons, neutrons and electrons. Atomic mass is the mass of an atom (The collection of masses of all the neutrons, protons and electrons in a single atom). As the masses of atoms are extremely small, they are expressed in unit called atomic mass unit (amu). 1 amu is equal to the one twelfth of the mass of a C-12 isotope.

Atomic Weight

There can be several isotopes for a single element. Atomic weight is the average weight calculated considering all the masses of isotopes. Each isotope is present in the environment in different percentages. When calculating the atomic weight, both isotope mass and their relative abundances are taken into consideration.

IUPAC definition for the atomic weight is as follows:

“An atomic weight (relative atomic mass) of an element from a specified source is the ratio of the average mass per atom of the element to 1/12 of the mass of an atom of 12C.”

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