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15 Cards in this Set

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A substance made up of only one type of atom.


A group of 2 or more types of atoms chemically combined.


A group of 2 or more types of atoms not chemically combined

Mass number

The total number of protons and neutrons in an element.

Atomic number

The total number of protons

Ionic bond

A chemical bond between a metal and a non-metal ion

Covalent bond

A chemical bond between non-metal atoms that combine by sharing electrons.

Difference between an atom and a molecule

An atom is on its own and not combined with anything, but a molecule is a group of atoms chemically combined.

How to find out how many neutrons there are in an atom

Mass number (bigger) - atomic number (smaller)

How to find how many protons there are in an atom

Look at the atomic number

How many electrons can each shell of an element hold?

1st shell = 2 electrons

2nd shell = 8 electrons

3rd shell = 8 electrons

How to find out which group an element is in

Number of electrons on the outer shell is the same group number.

Why are elements in noble gases so unreactive

They have a full outer shell if electrons

Formation of a positive ion

When a metal loses electrons in order to gain a full outer shell

Formation of a negative ion

When a metal gains electrons in order to get a full outer shell