test 2 answers

Question 1

question 1 a(i) atomic number

Answer 1

3

Question 2

question 1 a(ii) name the part if the atom that contains protons and neutrons

Answer 2

nucleus

Question 3

question 1 a(iii) group on the periodic table that contains this element

Answer 3

group 1

Question 4

question 1 a(iv) what’s the period

Answer 4

period 2

Question 5

question 1 a(V) name of the element

Answer 5

lithium

Question 6

question 1 a(vi) charge on the ion formed

Answer 6

+

Question 7

question 1 b(i) Explain what is meant by the term isotopes

Answer 7

an isotope is a element with a different number of neutrons with the same number of protons

Question 8

question 1 b(ii) calculate the relative atomic mass
Mass of isotope X=6 percentage abundance = 7.8%

Mass of isotope Y =7 percentage abundance = 92.2%

Answer 8

a= (mass of isotope X times abundance of X ) + (mass of isotope Y times abundance of Y) /100

A= (6 x 7.8) + (7 x 92.2) /100
A= 46.8+ 645.4 /100 = 692.2/100 = 6.922
A= 6.92