Question

8. Metals have the tendency to form a.cations......
9. Newlands could arrange elements upto .. out of 56 known
10. First period contains
....... elements.
Q.1.B) Write true or false:
1. The d-block elements are called transition elements.
2. The number of valence electrons is differents in a period.
3. Uranium has atomic number 94.
4. He, Ar, Kr belong to halogen family.
5. The d-block elements are normal elements.
6. Electron shells decreases progresively increase from left to right.
7. The valency of group 18 elements is zero.
Q.1.C) Choose the correct alternatives.
1. All the metals lie on the ............ side of the zig-zag line.
c) centre d) none of t
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Answer 1

Explanation:

8) Yes

9) Newlands could arrange upto 20 elements that is till Ca.

10) 1st period elements contains only 2 elements.

1) True

2) True

3) False. It has atomic number 92

4) False. They belong to VIII group

5) False

6) True

7) True

1) None of these

Answer 2

Answer:

8. yes

Explanation:

9. Newlands could arrange elements up to calcium (20) with atomic mass 40.1

10. First period contains 2 elements namely Hydrogen and Helium.

Q.1. B.

1. true

2. true

3. false, it's atomic number is 92.

4. false, they belongs to "Zero group elements."

5. False

6. True

7. True

Q. 1. c.

1.non of the above .All the metals lie on the left side of the zig-zag line on the periodic table.