Principles of chemistry 1d

Question 1

Groups

Answer 1

Vertical columns. Elements in each group have similar characteristics. Group number matches the number of electrons

Question 2

Period

Answer 2

Horizontal rows. The period number matches the number of shells

Question 3

Electron configuration

Answer 3

Electrons fill the shells from the nearest to the nucleus, out. Each shell has a limited number of electrons. First shell - 2 electrons. Second 8, Third 8
The more shells, the more energy

Question 4

Reactivity of noble gases

Answer 4

They dont react os the outer layer is full