Question

Four atoms of element X have the same mass as one atom of bromine.

(i) What is the relative atomic mass of element X?
80
(ii) Name element X.
(c) Eight atoms of element Y have the same mass as two atoms of silicon.
(i) What is the relative atomic mass of element Y?
56
(ii) Name element Y.

Answer 1

Neon and lithium.

Step-by-step explanation:

4x = 79.9 atomic mass

x = 19.98 atomic mass

The element having the nearest atomic mass to 19.98 is neon with an atomic mass of 20.180.

==

8y = 2*(28.085)

8y = 56.17

y = 7.021

The element having the nearest atomic mass to 7.021 is lithium with an atomic mass of 6.94..