ESTION 5 (Start on a new page.) Define the term isotope
(2)
Study the unknown elements A to E below
A
18x
x
D
19
10
IX Х
С
20 x
Х
21
11
Х
E
"Х
5.2.1
Which of the elements above are isotopes of each other?
(1
(1
5.2.2 Write down the name of this isotope. (Allom the
Calculate the relative atomic mass of copper by using the following isotopes
of copper
Copper isotopes: 63 Cu - 69% and 65Cu - 31%
ah
below
Write only the answer next to the questio​

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

there is none because earth is stationary and flat.

i think its 100.

hope this !