Atomic Structure, Isotopes and Ions

Front

What is the atomic number of sodium?

Back

11

Front

How many electrons does a neutral sodium atom have?

Back

11

Front

What is a Lewis dot model?

Back

A diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.

Front

How many valence electrons does sodium have?

Back

1 Valence electron

Front

What is an isotope?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

How do you calculate the mass number of an isotope?

Back

Mass number = Number of protons + Number of neutrons.

Front

What is the mass number of titanium with 22 neutrons?

Back

48 (22 neutrons + 26 protons).

Front

What happens to an atom when it loses electrons?

Back

It becomes positively charged.

Front

What is the charge of an ion that has lost two electrons?

Back

Positive 2 charge.

Front

How many neutrons does titanium-48 have?

Back

26 neutrons.