The table shows the total number of electrons in atom a and atom b.

atom number of electrons
a 10
b 12

which statement is correct?
a will give up two electrons to form bonds.
b will give up two electrons to form bonds.
both a and b will be chemically unreactive.
both a and b will gain electrons to become stable.

The correct statement is B will give up two electrons to form bonds.

Explanation:

We are given:

Number of electrons in Atom A = 10

Number of electrons in Atom B = 12

Writing the electronic configuration for both the atoms:

For A:

For B:

From the configuration, it is clearly visible that the configuration of Atom A is stable and this atom will neither gain or loose electrons to attain stability.

Atom B has 2 valence electrons and by loosing these 2 electrons, it will attain stable electronic configuration and form ion. Atom B will bond after loosing 2 electrons.

Hence, the correct statement is B will give up two electrons to form bonds.

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml