Question

ntinued)organize the information on atomic mass to complete the outline.atomic massa. nucleus of atom1. protons (positively charged)2. neutrons (neutral)3. accounts for most of total atomic massb. atomic mass unit1. 2. 3. c. protons1. 2. 3. 4. d. mass number1. 2.

Explanation:

• For B (Atomic mass unit): Defined relative to carbon-12, equals ~1.66×10⁻²⁴ g, and 1 proton/neutron ≈ 1 amu.
• For C (Protons): Positively charged, have a mass of ~1 amu, determine atomic number, and equal to electron count in neutral atoms.
• For D (Mass number): Sum of protons + neutrons, is an integer, and approximates atomic mass.

Answer:

B. Atomic mass unit

1. Defined as $\frac{1}{12}$ mass of carbon-12 atom
2. Equals $1.6605 \times 10^{-24}$ grams
3. 1 proton/neutron ≈ 1 atomic mass unit

C. Protons

1. Positively charged subatomic particle
2. Has a mass of ~1 atomic mass unit
3. Determines an element's atomic number
4. Equal to electron count in neutral atoms

D. Mass number

1. Sum of protons + neutrons in an atom
2. Is a whole number approximation of atomic mass