The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.

(i) Which two elements belong to the same group?

(ii) Which two elements belong to the same period?

Give reasons for your choice.

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Solution

(i) X and Z
X and Z have zero valencies hence they belong to the same group: Noble gases

(ii) Y and Z
Y: 2,4 and Z: 2,8 so both are them belong to the second period with two shells filled.

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The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively. (i) Which two elements belong to the same group? (ii) Which two elements belong to the same period? Give reasons for your choice.

(i) X and Z X and Z have zero valencies hence they belong to the same group: Noble gases (ii) Y and Z Y: 2,4 and Z: 2,8 so both are them belong to the second period with two shells filled.

The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.

(i) Which two elements belong to the same group?

(ii) Which two elements belong to the same period?

Give reasons for your choice.

(i) X and Z
X and Z have zero valencies hence they belong to the same group: Noble gases

(ii) Y and Z
Y: 2,4 and Z: 2,8 so both are them belong to the second period with two shells filled.