Physical Science Unit 8

Who was the first person to propose the idea of atom?

Democritus

Who discovered electrons

J.J Tompson

He discovered the nucleus of the atom

Chadwick

+ charge, found in the nucleus

Protons

-charge, found outside the nucleus and are virtually massless

Electrons

no charge, found inside the nucleus

Neutrons

Where can we Fong the number of protons in an atom, using the periodic table?

Atomic Number

The number of protons +neutrons in an atom is called the…

mass number

How can the number of electrons be determined

They’re the same as protons

The weighted average of all the isotopes in an element is called

Average Atomic Mass

Vertical columns on the periodic table are called

Families/ Groups

Horizontal rows on the periodic table are called

Period

Electrons in the outermost energy level of an atom are called

Valance electrons

Valance electrons are important because they are the ones that…

Take part in chemical reaction

Group 1

Alkali Metals

Group 2

Alkaline Metals

Group 3-12

Transition Metals

Group 13

Boron Family

Group 14

Carbon Family

Group 15

Nitrogen Family

Group 16

Chacogen Family

Group 17

Halogen Family

Group 18

Noble Gases Family

Group 1 of Rare earth metals

Lanthanide Series

Group 2 of Rare earth metals

Actinide Series