The mass number of elements practice exercise 1

A Calcium atom has a mass number of 40 and 20 neutrons. Determine the number of protons in the atom and explain your reasoning.  (2 marks)

A Calcium atom has a mass number of 40 and 20 neutrons. Determine the number of protons in the atom and explain your reasoning.  (2 marks)

A Calcium atom has a mass number of 40 and 20 neutrons. Determine the number of protons in the atom and explain your reasoning.  (2 marks)

The image below shows a nitrogen atom with 7 protons and 7 neutrons. A variation of nitrogen exists with 9 neutrons. Calculate the new mass number and explain why it is different from the original nitrogen atom. (2 marks)

The image below shows a nitrogen atom with 7 protons and 7 neutrons. A variation of nitrogen exists with 9 neutrons. Calculate the new mass number and explain why it is different from the original nitrogen atom. (2 marks)

The image below shows a nitrogen atom with 7 protons and 7 neutrons. A variation of nitrogen exists with 9 neutrons. Calculate the new mass number and explain why it is different from the original nitrogen atom. (2 marks)

State the mass number of Oxygen as shown in the diagram below.  (1 mark)

State the mass number of Oxygen as shown in the diagram below.  (1 mark)

Two Boron atoms have the same number of protons (5) but different mass numbers of 10 and 11.Explain the difference between these two variations. (2 marks)

Two Boron atoms have the same number of protons (5) but different mass numbers of 10 and 11.Explain the difference between these two variations. (2 marks)

Two Boron atoms have the same number of protons (5) but different mass numbers of 10 and 11. Explain the difference between these two variations. (2 marks)

Phosphorus has 15 protons. A variation of it has a mass number of 32.Calculate the number of neutrons and explain the steps.  (2 marks)

Phosphorus has 15 protons. A variation of it has a mass number of 32.Calculate the number of neutrons and explain the steps.  (2 marks)

Phosphorus has 15 protons. A variation of it has a mass number of 32. Calculate the number of neutrons and explain the steps.  (2 marks)

According to the image below showing the structure of Magnesium (Mg), what is its mass number?  (1 mark)

According to the image below showing the structure of Magnesium (Mg), what is its mass number?  (1 mark)

According to the image below showing the structure of Magnesium (Mg), what is its mass number?  (1 mark)

An Aluminium atom has 13 protons. The image below shows a structure with 14 neutrons. Calculate the mass number and explain what happens if the Aluminium variation has only 12 neutrons. (2 marks)

An Aluminium atom has 13 protons. The image below shows a structure with 14 neutrons. Calculate the mass number and explain what happens if the Aluminium variation has only 12 neutrons. (2 marks)

An Aluminium atom has 13 protons. The image below shows a structure with 14 neutrons. Calculate the mass number and explain what happens if the Aluminium variation has only 12 neutrons. (2 marks)

What is the mass number of an atom?  (1 mark)

What is the mass number of an atom?  (1 mark)

What is the mass number of an atom?  (1 mark)

What is the mass number of an atom?  (1 mark)

Which two particles in an atom are added together to get the mass number?  (1 mark)

Which two particles in an atom are added together to get the mass number?  (1 mark)

Which two particles in an atom are added together to get the mass number?  (1 mark)

Which two particles in an atom are added together to get the mass number?  (1 mark)

Lithium has 3 protons and 4 neutrons. What is its mass number?  (1 mark)

Lithium has 3 protons and 4 neutrons. What is its mass number?  (1 mark)

Lithium has 3 protons and 4 neutrons. What is its mass number?  (1 mark)