Physical Science Fall Semester Test Review #Educreatord12

The chart showing the classifications of elements according to their properties and increasing atomic number is called the periodic table.

• True

• False

The number of protons in an atom is the mass number.

• True

• False

Every atom of the same element has the same atomic number.

• True

• False

According to the law of conservation of mass, three atoms of calcium produce six atoms of calcium in a chemical reaction.

• True

• False

Elements arranged in vertical columns in the periodic table are called periods.

• True

• False

Every object in the universe is composed of atoms.

• True

• False

When an atom gains or loses electrons, the charged particle that results is called an molecule.

• True

• False

An element’s oxidation number indicates how many electrons the element must gain, lose, or share to become stable.

• True

• False

Metals are good conductors of heat and electricity.

• True

• False

The central core of an atom is called the hub.

• True

• False