13. In the table given below 1,2,13,14,15,16,17 represent group numbers and I,II,III,IV,V,VI represent period numbers. Some elements are listed in the table. Answer the questions that follow
1 2 13 14 15 16 17 18
I Li B C S O F
II Na Mg Al R P S X P
III Y Ca As Se Br
IV Rb Sb Te Q
V Cs Bi
VI Fr
1. What is the atomic number of X and Y?
2. Is P reactive?
3. The metal present in common salt ----
4. Give the increasing order of metallic character for the elements in group 1.
5. Give the formula of the hydride formed by R?
6. Name the element S?
7. Why are group 17 elements called electronegative?
8. Arrange the elements of group 17 in the decreasing order of electronegativity.
9. Arrange the elements of Period II(exclude P) in the increasing order of metallic character.
10.Identify the metalloid(s) in the table.
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. potassium has 1 electron in the outermost shell. Its electronic configuration is 2,8,8,1.
2. Berylium (
4
Be) and Calcium (
20
Ca) belong to group 2. They both are alkaline earth metals and contain valency as 2 and hence, placed in group 2.
3.
26
Fe,
19
K and
20
Ca all belong to the 4th period. Moving left to right across a period, atomic radius usually decreases. Hence, K has the biggest atomic size as compared to
20
Ca and
26
Fe.
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