Atomic structure

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Question 6
Medium
a.

Complete the sentences about the structure of an atom. Use words from the list below:

electrons, negative, neutral, neutrons, positive, protons

An atom has a nucleus with a .................... charge. The nucleus is made up of .................... and .................... .

[2]
b.

Look at the information about two isotopes of oxygen:

Isotope 1: 816OIsotope 2: 818O\text{Isotope 1: } {}^{16}_{8}\text{O} \qquad \text{Isotope 2: } {}^{18}_{8}\text{O}Isotope 1: 816​OIsotope 2: 818​O

Which two statements about the isotopes of oxygen are correct?

  • Oxygen has 16 protons.
  • The atomic number of oxygen is 8.
  • The electrons are heavier than the protons.
  • The isotopes of oxygen have different numbers of neutrons.
  • The isotopes of oxygen have different numbers of protons.
  • The mass number is the same for both isotopes.
[2]
c.

The diagram shows an oxygen atom.

An electron configuration diagram of an oxygen atom. The center represents the nucleus and is labeled with the letter 'O'. Surrounding the nucleus are two concentric circles representing electron shells. The inner circle has 2 electrons shown as small cross marks ('x') near the top. The outer circle has 6 electrons shown as small cross marks: one pair at the top, one pair on the left side, and two single electrons on the right and bottom sides.

Explain why oxygen is in Group 6 of the Periodic Table.

[1]
d.

Oxygen is in Group 6 of the Periodic Table. Oxygen is a non-metal.

Why do non-metals form negative ions?

[2]
e.

Oxygen reacts with magnesium to form magnesium oxide.

  • The formula for magnesium oxide is MgO\text{MgO}MgO.
  • The symbol for an oxide ion is O2−\text{O}^{2-}O2−.

What is the symbol for a magnesium ion?

[1]

Atomic structure Questions

  1. GCSE
  2. /Chemistry
  3. /Atomic structure