GCSE AQA Chemistry The Periodic Table: This question is about atomic st

Question

This question is about atomic structure and the periodic table.

Gallium (Ga) is an element that has two isotopes.

1. Give the meaning of ‘isotopes’.

You should answer in terms of subatomic particles.

2. Table 1 shows the mass numbers and percentage abundances of the isotopes of gallium.

Table 1

| Mass number | Percentage abundance (%) |
|-------------|--------------------------|
| 69          | 60                       |
| 71          | 40                       |

Calculate the relative atomic mass (Ar) of gallium.

Give your answer to 1 decimal place.

3. Gallium (Ga) is in Group 3 of the modern periodic table.

Give the numbers of electrons and neutrons in an atom of the isotope ^{69}_{31}Ga.

Number of electrons __________
Number of neutrons __________

4. What is the most likely formula of a gallium ion?

Tick (✓) one box.

- Ga+
- Ga-
- Ga^{2+}
- Ga^{3-}

5. Gallium was discovered six years after Mendeleev published his periodic table.

Give two reasons why the discovery of gallium helped Mendeleev’s periodic table to become accepted.

This question is about atomic structure and the periodic table - AQA - GCSE Chemistry - Question 2 - 2021 - Paper 1

Worked Solution & Example Answer:This question is about atomic structure and the periodic table - AQA - GCSE Chemistry - Question 2 - 2021 - Paper 1

Give the meaning of ‘isotopes’

Calculate the relative atomic mass (Ar) of gallium.

Give the numbers of electrons and neutrons in an atom of the isotope ^{69}_{31}Ga

What is the most likely formula of a gallium ion?

Give two reasons why the discovery of gallium helped Mendeleev’s periodic table to become accepted.

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