8th Grade Science Review

Front

What are elements with seven valence electrons known for?

Back

They are highly reactive.

Front

What do the arrows labeled III in a diagram point to in an atom?

Back

Neutrons.

Front

What physical characteristic is most likely to describe a sample of sulfur?

Back

Brittleness.

Front

What is the chemical formula for potassium nitrate?

Back

KNO3.

Front

How many total atoms are in each unit of potassium nitrate (KNO3)?

Back

5.

Tags

NGSS.MS-PS1-1

Front

How many protons are present in a neon atom's nucleus?

Back

10.

Front

What is the definition of a nonmetal?

Back

A nonmetal is an element that typically lacks the properties of metals, such as conductivity and malleability.

Front

What is the significance of valence electrons in chemical reactions?

Back

Valence electrons determine how an atom can bond with other atoms.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Front

What is the difference between malleability and ductility?

Back

Malleability is the ability to be shaped or bent, while ductility is the ability to be stretched into a wire.