First Year Chemistry Homework – Week 2

Day 1  Day 2  Day 3  Day 4  Day 5  Day 6

Questions for Days 1 and 2 use the same electronic configuration as written in the week 1 homework. You can use your work for week 1 to continue with this week’s work.

Day 1

Question 1

Write the electronic configuration, using the shorthand method, the following atoms/ions:

  • Na+

  • O2-

  • Mg2+

  • Cl-

  • Al3+

  • Ca2+

Day 2

Question 1

Write the electronic configuration, using the box and arrow methof,​​ for the following atoms:

  • Fe2+

  • Sc3+

  • Cu

  • O

  • C2-

  • Pb2+

Day 3

Question 1

Define the term: Ionisation Energy.

Question 2

Write an equation for the ionisation energy of oxygen.

Day 4

Question 1

What is the general trend in ionisation energies for period 2?

Question 2

Explain why neon is the smallest atom in period 2.

Day 5

Question 1

There are two exceptions in the ionisation energies for both period 2 and period 3, explain both exceptions in detail.

Day 6

Question 1

What is the relationship between the radius and ionisation energy?

Question 2

A sample of naturally occurring silicon consists Si-28 (amu = 27.9769), Si-29 (amu = 28.9765) and Si-30 (amu = 29.9738).​​ 

If the atomic mass of silicon is 28.0855 and the natural abundance of Si-29 is 4.67%, what are the natural abundances of Si-28 and Si-30?