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Nikolay [14]
3 years ago
10

The elements from this section of the periodic table all belong to the same

Chemistry
1 answer:
egoroff_w [7]3 years ago
6 0

Answer:

C. Period

Explanation:

The elements from this section of the periodic table belongs to the same period.

A period on the periodic table is a horizontal arrangement of elements according to their atomic number.

  • A group or family is the vertical organization of elements.
  • Valence is the number of outer shell electrons an atom possess.
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Magnesium has three stable isotopes. The most commonly occurring isotope, 24 Mg, has an isotopic mass of 23.985 u and makes up 7
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Answer:

Average atomic mass = 24.3051 amu

Explanation:

Average Atomic Mass = (Mass of Isotope 1 x Fractional Abundance of Isotope 1) + (Mass of Isotope 2 x Fractional Abundance of Isotope 2) + ......

For 24 Mg

Mass = 23.985 amu

Fractional Abundance = 0.7899

Mass * Fractional Abundance = 18.9458

For 25 Mg

Mass = 24.986 amu

Fractional Abundance = 0.10

Mass * Fractional Abundance = 2.4986

For  26 Mg

Mass = 25.983

Fractional Abundance = 0.1101

Mass * Fractional Abundance = 2.8607

Average atomic mass = 24 Mg + 25 Mg + 26 Mg

Average atomic mass = 18.9458 + 2.4986 + 2.8607

Average atomic mass = 24.3051 amu

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What is the molar mass, in grams, of a mole of an element equal to?
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Answer:

B. the atomic weight of the element

Explanation:

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