2nd 9-Weeks EXAM (Science)

Front

What do elements in the same group of the periodic table have in common?

Back

They have the same number of valence electrons.

Front

What happens to atoms with few valence electrons (1-3)?

Back

They tend to lose them.

Front

Which element has 7 valence electrons?

Back

Chlorine (Cl)

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the significance of valence electrons?

Back

They determine how an element reacts chemically.

Front

What is the periodic table?

Back

A tabular arrangement of elements organized by increasing atomic number.

Front

What are protons?

Back

Positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutral particles found in the nucleus of an atom.

Front

What are electrons?

Back

Negatively charged particles that orbit the nucleus of an atom.

Front

What is an ion?

Back

An atom or molecule that has gained or lost one or more electrons, resulting in a charge.