chemistry

Question 1

what is the atomic number

Answer 1

number of protons in the nucleus

Question 2

what is the mass number

Answer 2

total number of protons and neutrons

Question 3

what is the electronic configuration in each shell

Answer 3

shell 1: 2. shell 2: 8 shell 3: 8

Question 4

what are the groups in the periodic table

Answer 4

columns: elements with similar chemical properties , same number of outer electrons

Question 5

what are the periods in the periodic table

Answer 5

rows: indicates number of electron shells

Question 6

group 1 include the…

Answer 6

alkali metals

Question 7

group 7 include the…

Answer 7

halogens

Question 8

the reactivity decreases down group 1 true or false

Answer 8

false it increases

Question 9

the reactivity decreases down group 7 true or false

Answer 9

true

Question 10

separating an insoluble solid and solvent is called..

Answer 10

filtration

Question 11

seperating a soluble solid and solvent is called..

Answer 11

crystallisation or distillation

Question 12

separating a mixture of dyes is called..

Answer 12

chromatography

Question 13

group 0 include the..

Answer 13

noble gases