Unit 2: Atoms and Periodic Trends

Front

What is an anion?

Back

An anion is a negatively charged ion.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

What happens to an atom when it gains a valence electron?

Back

When an atom gains a valence electron, it becomes a negative ion.

Front

Where are metals located on the periodic table?

Back

Metals are located on the left side and in the center of the periodic table.

Front

What is a vertical column in the periodic table called?

Back

A vertical column in the periodic table is called a group or family.

Front

What is a cation?

Back

A cation is a positively charged ion.

Front

What is the significance of the periodic table's groups?

Back

Elements in the same group have similar chemical properties and the same number of valence electrons.

Front

What is the difference between atomic number and mass number?

Back

The atomic number is the number of protons in an atom, while the mass number is the sum of protons and neutrons.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is the trend in atomic radius across a period?

Back

The atomic radius decreases from left to right across a period due to increased nuclear charge.