GCSE OCR Gateway Chemistry 1.1 Simple Model of the Atom: Look at the information about tw

Question

Look at the information about two atoms of chlorine.

$$^{35}_{17}	ext{Cl}$$
$$^{37}_{17}	ext{Cl}$$

The atomic number of chlorine is 17.

(a) What is meant by atomic number?

(b) These two atoms of chlorine are isotopes.
Explain why these two atoms of chlorine are isotopes.

(c) Look at the information about other atoms and ions.

| Atom or ion | Atomic number | Mass number | Number of protons | Number of neutrons | Number of electrons | Electronic structure |
|-------------|---------------|-------------|-------------------|--------------------|---------------------|---------------------|
| S           | 16            | 32          |                   | 16                 |                     |                     |
| B           | 5             | 11          | 5                 |                    |                     | 2.3                 |
| F^-         | 9             | 19          | 9                 | 10                 | 10                  | 2.8                 |
| Li^+       | 3             | 7           | 3                 | 4                  |                     |                     |

Complete the table.

Look at the information about two atoms of chlorine - OCR Gateway - GCSE Chemistry - Question 19 - 2018 - Paper 1

Worked Solution & Example Answer:Look at the information about two atoms of chlorine - OCR Gateway - GCSE Chemistry - Question 19 - 2018 - Paper 1

What is meant by atomic number?

Explain why these two atoms of chlorine are isotopes.

Complete the table.

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