Compound & atom ?'s

First and last name:

All compounds are made up of two or more

• elements.
• nuclei.
• electrons.
• mixtures.

The nucleus of an atom has a positive charge because the nucleus contains

• electrons.
• protons.
• mass.
• neutrons.

On the periodic table, elements with the same number of valence electrons are in the same

• square.
• period.
• group.
• block.

When an atom loses or gains electrons, it becomes a(n)

• ion.
• formula.
• crystal.
• subscript.

A polyatomic ion is made up of more than one atom/element.

• True
• False

The atomic number of an element is the number of protons in the nucleus of an atom.

• True
• False

Which element is more reactive?

• An element that has one valence electron.
• An element that has eight valence electrons.
• An element that has five valence electrons.

Why do ionic compounds generally have high melting points?

• They have strong bonds.
• They have weak bonds.
• They can withstand heat.

Why do molecular compounds generally have low melting points?

• They have strong bonds.
• They have weak bonds.
• They don't like heat.