Page 22 - ACE YR IGCSE A TOP APPROACH TO CHEM

(c) What is the name given to all elements same as Z?

[1]

(d) Z is an unreactive element. Explain why.

[1]

(e) Atom U has the nucleon number of 27.
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(i) What is nucleon number?

[1]
(ii) What is the number of neutrons in atom U?

[1]

(iii) How many electrons are there in atom U?

[1]

(iv) Give a physical property of U.

[1]

[Total: 14]

Clone May / June 2018

7 Uranium, U, atomic number 92, is used as fuel for nuclear power plants.

(a) Uranium bombards with neutrons and splits into barium, atomic number 56 and another
atoms of element Z.

uranium + neutrons ➞ barium + Z

(i) Suggest the identity of element Z.

[1]
(ii) In which period of the Periodic Table is element Z?

[1]
(iii) Predict the number of outer shell electrons in an atom of element Z.

[1]

Chapter 2 Atoms, Elements and Compounds 19

Chapter 2.indd 19 3/4/22 11:59 AM