A sample of boron contains aluminium as the only impurity. A mass spectrum of the mixture shows three lines corresponding to three ions, X+
,Y+
and Z+
.

Ion X+
Y+
Z+

m / e 10 11 27

%abundance
15.52 74.48 10.00

Which statements are correct?

1 There are more electrons in Z+

than in X+
.

2 The Ar of boron in the sample is 10.83 to four significant figures.

3 There are more protons in Y+

than in X+
.