Electron Arrangement Homework

Front

What are the two subatomic particles that contribute the most to the mass of an atom?

Back

Protons and Neutrons.

Front

What must an atom have to be considered neutral if it has 12 positively charged subatomic particles?

Back

12 electrons.

Front

What is the electron configuration for Selenium?

Back

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴.

Front

How many electrons should Fluorine have around its Lewis dot model?

Back

7.

Front

What is the mass number of an atom with 19 total nucleons?

Back

19.

Front

Define 'mass number'.

Back

The total number of protons and neutrons in an atom's nucleus.

Front

What is the charge of a proton?

Back

Positive.

Front

What is the charge of an electron?

Back

Negative.

Front

What is the charge of a neutron?

Back

Neutral.

Front

How do you determine the number of neutrons in an atom?

Back

Subtract the number of protons from the mass number.