Quick answer: An atom has a tiny nucleus of protons and neutrons, with electrons in shells around it. This Chemistry 9-10 test on atomic structure has 9 questions worth 20 marks, to do in 45 minutes: nuclear particles, iron atom and ion and defining isotopes. The mark scheme is on a separate page; free printable PDF.
This test checks atomic structure, isotopes and relative atomic mass. Show every step of a calculation, give units where they exist, and write your answers in full sentences when a question says explain.
Level: Chemistry grades 9-10 (GCSE · IGCSE · O Level · Class 9-10) · Curriculum: HS-PS1-1, GCSE C1
Question 1 Nuclear particles (2 marks)
Name the two types of particle found in the nucleus of an atom and state the relative charge of each. (2 marks)Question 2 Iron atom and ion (3 marks)
An iron atom has atomic number 26 and mass number 56.- Calculate the number of protons and neutrons. (2 marks)
- State the number of electrons in an Fe³⁺ ion. (1 mark)
Question 3 Defining isotopes (2 marks)
Define the term isotopes. (2 marks)Question 4 Lithium relative atomic mass (3 marks)
Lithium is 7.5 % lithium-6 and 92.5 % lithium-7. Calculate the relative atomic mass of lithium to 2 significant figures. (3 marks)Question 5 Neutral atoms (2 marks)
Explain why an atom has no overall electrical charge. (2 marks)Question 6 Same chemistry (2 marks)
Explain why chlorine-35 and chlorine-37 react in the same way. (2 marks)Question 7 Atom Z (2 marks)
Atom Z is shown below.- Identify the element, given that nitrogen has atomic number 7. (1 mark)
- State its mass number. (1 mark)
Question 8 A decimal Ar (2 marks)
Chlorine has a relative atomic mass of 35.5. Explain why this is not a whole number. (2 marks)Question 9 Uranium isotopes (2 marks)
Uranium has atomic number 92. Calculate the number of neutrons in uranium-235 and uranium-238. (2 marks)
