4. 2
(b) on micro scale
on commercial scale
(d) on economic scale
Which one of the following compounds can be separated by physical means?
(a) mixture (b) element
(c) compound (d) radical
The most abundant element occurring
5.
6.
3.
7.

I don't know this

Explanation:

try to search it on Google ypu will find new answers ans this is a simple one

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer