Question
The numbers of protons and neutrons and the electronic structures of four particles, W, X, Y and Z, are shown.
Which particles have the same chemical properties?
A W and Y B W and Z C X and Y D X and Z
Answer/Explanation
Ans:
C
Question
Lithium and fluorine react to form lithium fluoride.
A student writes three statements about the reaction.
1 Lithium atoms lose an electron when they react.
2 Each fluoride ion has one more electron than a fluorine atom.
3 Lithium fluoride is a mixture of elements.
Which statements are correct?
A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3
Answer/Explanation
Ans: A
Question
Element X has 7 protons.
Element Y has 8 more protons than X.
Which statement about element Y is correct?
A Y has more electron shells than X.
B Y has more electrons in its outer shell than X.
C Y is in a different group of the Periodic Table from X.
D Y is in the same period of the Periodic Table as X.
Answer/Explanation
Ans: A
Question
The atomic number and nucleon number of a potassium atom are shown.
How many protons, neutrons and electrons are in a potassium ion, $\mathrm{K}^{+}$?
▶️Answer/Explanation
Ans:A