Physical Science - Atoms & Periodic Table 2

The positively charged center of an atom is the __

Atoms of the same element that have different numbers of neutrons are known as

A horizontal row on the periodic table, numbered 1-7 is known as a

__ is a subatomic particle with an electrical charge of -1, located in the cloud.

Vertical columns on the periodic table, numbered 1-18 are known as

__ are atoms of the same element that have different numbers of neutron.

Elements in the two rows seperated at the bottom of the Periodic Table are the

__ is a subatomic particle with an electrical charge of +1, located in the nucleus.

A group of atoms of the same type are known as

Atomsof elements transfer or share __ in order to have a full outer energy level.

Elements that are in the same __ have the same number of electrons in their outer energy level.

__ is a subatomic particle with a neutral charge, located in the nucleus.

The majority of the mass of an atom is concentrated in the __

Smaller particles that make up protons and neutrons are __

The smallest unit of matter is the

A helium atom has a full outer energy level and is located on the far right side of the periodic table making it a

A(n) __ is an atom that has lost or gained electrons.

Mendeleev was able to predict the existence and properties of undiscovered elements by leaving __ in the table.

Only about __ of the eleemnts on the periodic table today were known when Mendeleev developed his table.

Chlorine is located in period 3 and group(family) 17, therefore it has __ energy levels and __ outer shell electrons.