Chem Unit 1 Chp 3 Atomic structure

What are 3 subatomic particles?

Proton, neutron, electron

What are 2 types of molecules?

Molecules of elements (one type of atom)

Molecules of compounds (two or more types of atoms)

OBJQ

What is the atomic number?

Number of protons in the nucleus of the atom

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What is the mass number?

Total number of protons and neutrons in the nucleus of an atom

OBJR

What is the unit of relative atomic mass?

Amu → atomic mass unit

What is Avogadro’s number/constant?

6.02 x 10^23 atoms or molecules or ions

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What is an atom?

Smallest particles of an element that consist of electrons surrounding the nucleus and that contain protons and neutrons

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What is a molecule?

A group of two or more atoms chemically bonded together by a covalent bond

What are 3 basic bondings?

Ionic bonding →metal x non-metal 

Covalent bonding → non-metal x non-metal

Metallic bonding → metal x metal

Why do neutral atoms have no charge?

The proton number is equal to the electron number, but they have opposite charges. So they cancel each other, making the atom neutral.

What are 2 types of ions?

Positive ions→cation→lose electron

Negative ions→anion→gain electro

What are particles' relative mass and relative charge?

Observation of numbers of protons and electrons in the ions

Positive ions→more protons

Negative ions→more electrons

How to find the number of neutrons?

Neutrons = mass number - number of protons

How to find the mass number?

Mass number = number of protons + number of neutrons