Week 3

Question 1

John Dalton

Answer 1

Responsible for the basis of the modern atomic theory

Question 2

Daltons atomic theory

Answer 2

• all matter is composed of tiny, indivisible particles called atoms
• all atoms of the same element are identical (mass and properties)
• compounds contain atoms of different elements combined in whole number ratios
• atoms are neither created nor destroyed in chemical reactions
• the most stable compounds of two elements contain atoms in a one to one ratio

Question 3

Atomic theory disagreements

Answer 3

1. atoms have subatomic particles
2. Existence of isotopes
3. Can be any ratio

Question 4

Antoine Lavoisier

Answer 4

Contributed to the law of conservation of mass

Question 5

Law conservation of mass

Answer 5

States that during a chemical reaction, the mass of reactants is equal to the mass of the products

Question 6

Demitri Mendeleev

Answer 6

Father of the modern periodic table

Question 7

Electron configurations

Answer 7

Directly influence the properties of elements

Periodic table classifies the elements according to their atomic numbers and thus also by their electron configurations

Question 8

Group

Answer 8

Same number of electrons in their outer shell

Resemble one another in chemical properties

Question 9

Period

Answer 9

Same number of electron shells occupied

Question 10

Blocks

Answer 10

Named according to the sub-shells which are being filled

Question 11

S block

Answer 11

1- alkaline metals

2- alkaline earth metals

Question 12

P block

Answer 12

VII- halogens

VIII- noble gases

Question 13

D block

Answer 13

All called transition metals

Question 14

F block

Answer 14

4f row- lanthanides

5f row- actinides

Question 15

Number of columns for a block

Answer 15

Because _ sub shell has _ orbital and maximum of _ electrons