Atomic Structure & Isotopes

Front

The number on the top left is

Back

the number of protons and neutrons

Front

Approximate mass of an atom with 26 protons, 26 electrons, and 19 neutrons?

Back

45 amu

Front

Which two notations represent isotopes of the same element?

Back

Front

Which numerical setup can be used to determine the atomic mass of lithium?
Options: (7.5)(6.02 amu) + (92.5)(7.02 amu) , (0.925)(6.02 amu) + (0.075)(7.02 amu) , (0.075)(6.02 amu) + (0.925)(7.02 amu) , (92.5)(6.02 amu) + (7.5)(7.02 amu)

Back

(0.075)(6.02 amu) + (0.925)(7.02 amu)

Front

Two atoms that are different isotopes of the same element have:

Back

the same number of protons but a different number of neutrons

Front

the mass of an electron is

Back

less than the mass of a neutron

Front

Which notations represent atoms that have the same number of protons but a different number of neutrons? Options: H-2 and He-3, S-32 and S-32, Cl-35 and Cl-37, Ga-70 and Ge-73

Back

Cl-35 and Cl-37

Front

Atoms are neutral because the number of:

• protons equals the number of neutrons
• protons equals the numbers of electrons
• neutrons is greater than the number of protons
• neutrons is greater than the number of electrons

Back

protons equals the numbers of electrons

Front

Total number of neutrons in K-42

Back

23

Front

Which notations represent hydrogen isotopes?

Back