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Vocabulary
Atoms
Elements
Compounds
100

What is an atom?

An atom is a small particle that is the building block of matter.

100

What are the three subatomic particles that make up an atom?

Protons, Neutrons, and Electrons

100

What is the atomic symbol of Helium?

He

100

What is the chemical formula for water?

H2O

200

What is an element?

An element is a substance that contains only one kind of atom.

200

What is the charge and location of the protons and neutrons?

Protons- positive (+); nucleus (middle)

Neutrons- neutral (no charge); nucleus (middle)

200

Write down the atomic symbol and atomic number for tin.

Symbol- Sn

Number- 50

200

What is the elemental ratio for the following compound:

80% Fluorine, 20% Carbon

4 Fluorine: 1 Carbon

or

4 F: 1 C

300

What is a molecule?

A molecule is two or more atoms that are held together by covalent bonds and act as a unit.
300

What is the charge and location of an electron?

Negative (-); Outside the atom (in orbitals)

300


What is the atomic mass of Rhenium?

186.207

300

What is the difference between an element and a compound?

An element is just one type of atom and a compound is made up of more than one type of atom.
400

What is a compound?

A compound is a substance containing atoms of two or more different elements chemically bonded together.

400

Why are protons important?

They give the atom its identity.  They are what make each atom unique.
400

How many protons and electrons are in one atom of Mercury?

80

400

What is the elemental ratio for the following compound:

50% Oxygen, 25% Carbon, 25% Hydrogen

2 Oxygen: 1 Carbon: 1 Hydrogen

or

2 O: 1 C: 1 H

500

What is a chemical formula?

A chemical formula is a set of chemical symbols showing the elements present in a compound and their relative proportions, and in some cases the structure of the compound.

500

Why are electrons important?

They give each atom its unique properties.

500

How many neutrons are in an atom of Bismuth?

126

500

What is the chemical formula for the following mystery compound?

25% Nitrogen, 75% Hydrogen

NH3