7th Grade Science

Which property is shared by most molecular compounds?

• high boiling point

• high melting point

• low melting point

• nonpolar bonds

When an atom loses an electron it becomes a _______ ___.

In a chemical formula for an ionic compound which item is written first?

• the name of the positive ion

• the name of the negative ion

• the name of the electron

• the name of the the charges

Magnesium bromide is an ionic compound with the chemical formula MgBr2, What does the "2" tell you?

• Bromide has a 2-charge

• There are two magnesium ions to every

  bromide ion

• There are two bromide ions for every

  magnesium ion.

The chemical name for the compound with the formula Na2S is ______ _______.

What is a double bond?

• a bond between two atoms

• one pair of electrons shared between two atoms

• two pairs of electrons shared between two atoms

• three pairs of electrons shared between two atoms

Electrons involved in bonding between atoms are _______ _______.

A mixture made of two or more elements, at least one of which is metal is called an ______.

What is it called when metal can be rolled into thin sheets, as in aluminum foil or beaten into complex shapes?

Which of the following groups contains the most reactive elements?

• Alkali Metals

• Alkali Earth Metals

• Hallogens

• Noble Gases