An atom of potassium has an atomic number of 19 and a mass number of 39. (i) Complete the table to show the number of protons, neutrons and electrons in this potassium atom. number of protons neutrons electrons (ii) Describe the positions of these particles in the potassium atom. (iii) State the electronic configuration of this potassium atom. (iv) Give the relative mass of an electron.

GCSE Edexcel Chemistry Relative formula Mass: An atom of potassium has an atom

An atom of potassium has an atomic number of 19 and a mass number of 39 - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1

Question 4

An atom of potassium has an atomic number of 19 and a mass number of 39. (i) Complete the table to show the number of protons, neutrons and electrons in this potassi... show full transcript

Worked Solution & Example Answer:An atom of potassium has an atomic number of 19 and a mass number of 39 - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1

Step 1

Complete the table to show the number of protons, neutrons and electrons in this potassium atom.

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Answer

In a potassium atom with an atomic number of 19 and a mass number of 39:

Protons: 19 (equal to the atomic number)
Neutrons: 39 - 19 = 20 (mass number - atomic number)
Electrons: 19 (electrons equal to protons in a neutral atom)

Thus, the completed table will show:

number of
protons	19
neutrons	20
electrons	19

Step 2

Describe the positions of these particles in the potassium atom.

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Answer

In a potassium atom:

Protons and neutrons are located in the nucleus at the center of the atom.
Electrons are found in shells or orbitals around the nucleus, moving in defined energy levels.

Step 3

State the electronic configuration of this potassium atom.

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Answer

The electronic configuration of a potassium atom is represented as:

$2.8.8.1$

This indicates the distribution of electrons in the energy levels (shells) around the nucleus.

Step 4

Give the relative mass of an electron.

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Answer

The relative mass of an electron is approximately:

$\frac{1}{1837}$

This indicates that the mass of an electron is very small compared to that of protons and neutrons.

An atom of potassium has an atomic number of 19 and a mass number of 39 - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1

Worked Solution & Example Answer:An atom of potassium has an atomic number of 19 and a mass number of 39 - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1

Complete the table to show the number of protons, neutrons and electrons in this potassium atom.

Describe the positions of these particles in the potassium atom.

State the electronic configuration of this potassium atom.

Give the relative mass of an electron.

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