Question

1. an element has an atomic number of 76. the number of protons and electrons in a neutral atom of the element are

a. 152 protons and 76 electrons
b. 76 protons and 0 electrons
c. 38 protons and 38 electrons
d. 76 protons and 76 electrons

1. the sum of the protons and neutrons in an atom equals the

a. atomic number
b. mass number
c. nucleus number
d. atomic mass

1. isotopes of the same element have different

a. numbers of neutrons
b. numbers of protons
c. numbers of electrons
d. atomic number

1. isotopes of the same element have different

a. positions on the periodic table
b. chemical behavior
c. atomic numbers
d. mass numbers

Explanation:

Step1: Recall atomic - number property

The atomic number is equal to the number of protons in an atom. In a neutral atom, the number of electrons is equal to the number of protons. Given an atomic number of 76, there are 76 protons and 76 electrons.

Step2: Recall mass - number definition

The sum of the protons and neutrons in an atom is called the mass number.

Step3: Recall isotope properties

Isotopes of the same element have the same number of protons (and thus the same atomic number and number of electrons in a neutral state), but different numbers of neutrons, which leads to different mass numbers. They have the same position on the periodic table and similar chemical behavior.

Answer:

1. d. 76 protons and 76 electrons
2. b. Mass number
3. a. numbers of neutrons
4. d. mass numbers