Question

2. Fill in the blanks:
a. The law of chemical periodicity was given by
b. In the Periodic Table, vertical columns are called
and horizontal rows are called
of
c. An element with atomic number 17 belongs to the group
d. In Dobereiner's triads, the atomic mass of the middle element is equal to the
those of the other two elements.
e. The element named as Eka-boron by Mendeleev was later named as
f. The element named as Eka-silicon by Mendeleev was later named as
g. The element named as Eka-aluminium by Mendeleev was later named as
h. The elements of Group 1 are known as
1. The elements of Group 17 are known as
j. The elements of group 2 are known as
k. The elements of Group 18 are known as
1. The valency of Group 18 elements is​

Answer 1

Answer:

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Answer 2

Answer:

1. ROBERT THOMAS SANDERSON
2. periods, groups
3. group-17, CHLORINE.
4. FALSE, we hv to add the two elements n then divide by 2 that no. will be equal to that of the mass of middle element
5. SCANDIUM
6. GERMANIUM
7. GALLIUM
8. ALKALI METALS
9. HALOGENS
10. ALKALINE EARTH METALS
11. NOBLE GASES
12. 0

Explanation:

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