Form 5 homework – Week 1

For each question please give reasons + show your working if necessary.

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

Day 1

Question 1

In which set do all the species contain more electrons than neutrons?

  • 14N,​​ 16O,​​ 11C

  • 14N,​​ 16O,​​ 11C4-

  • 14N3-,​​ 16O2-,​​ 11C

  • 14N3-,​​ 16O2-,​​ 11C4+

Question 2

The full electronic configuration of an element is 2,8,4. In which group and period is this element found in?

  • Group 2, Period 3

  • Group 3, period 2

  • Group 3, period 4

  • Group 4, period 3

Day 2

Question 1

Which species have the same number of electrons?

  • S2-

  • Cl-

  • Ne

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

Question 2

A sample of zinc has the following composition:

64Zn at 55%,​​ 66Zn at 40% and​​ 68Zn at 5%

What is the relative atomic mass of the zinc in this sample?

  • 64.5

  • 65.0

  • 65.9

  • 66.4

Day 3

Question 1

Which statements about the isotopes of an element are correct?

  • They have the same chemical properties.

  • The have different physical properties.

  • The have the same number of protons and electrons.

  • I and II only

  • I and III only

  • II and III only

  • I, II and III only

Question 2

The X+​​ ion of element X has 16 electrons and a nucleon number of 37.

What is the correct Group number for element X?

  • VII

  • VIII

  • III

  • I

Day 4

Question 1

Four ions are listed.

N3-​​   Al3+  Li+  Cl-

Which pair of ions have the same electronic configuration?

  • N3-​​ and Li+

  • Al3+​​ and N3-

  • Cl-​​ and Al3+

  • Li+​​ and Cl-

Question 2

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Day 5

Question 1

The electronic configurations of four elements, P, Q, R and S, are shown.

Which elements are unreactive monoatomic gases?​​ 

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  • P and Q

  • P and S

  • Q and R

  • S only

Question 2

Which pair of atoms contains the same number of neutrons?

  • 5927Co and​​ 5928Ni

  • 6429Cu and​​ 6529Cu

  • 6429Cu and​​ 6530Zn

  • 6429Cu and​​ 5928Ni

Day 6

Question 1

Which statement explains why isotopes of the same element have the same chemical properties?

  • The have the same electronic structure.

  • The have the same relative mass.

  • They have the same nucleon number.

  • They have the same proton number.

Question 2

Which statements about isotopes of the same element are correct?

  • The are atoms which have the same chemical properties because they have the same number of electrons in their outer shell.

  • They are atoms which have the same number of electrons and neutrons but different number of protons

  • The are atoms which have the same number of electrons and protons but different number of neutrons.

  • I and II

  • I and III

  • II only

  • III only