Question

Chapter 2: Periodic Classification of Elements (1) The number of electrons in the outermost shell of alkali metals

is

(a) 1 (b) 2

(c) 3

(d) 7

(2) Alkaline earth metals have valency 2. This means that their

position in the modern periodic table is in . (a) Group 2 (b) Group 16 (c) Period 2 (d) d-block

(3) Molecular formula of the chloride of an element X is XCL. This compound is a solid having high melting point. Which of the following elements be present in the same group as X

(a) Na (b) Mg (c) Al (d) Si (4) In which block of the modern periodic table are the nonmetals

found?

(a) s-block (b) p-block (©) d-block (d) /-block (5) Which of the following triads does not follow Dobereiner's law

of triads? (a) Li, Na, K (b) Ca, Sr, Ba (c) Be, Mg, Ca ( Cu,AgAu (6) During Newlands' time . elements were known.

(a) 56

(b) 65

(c) 63

(d) 36

(7) The law of octaves was given by (a) Dobereiner (b) Newlands (0) Mendeleev (d) Moseley

(B) Eka-boron was subsequently named as

(a) gallium

() scandium

(b) germanium

(d) molybdenum
​

Answer 1

Answer:

1 electrons

Explanation:

Group 2

...

i only knew about two ✌

Answer 2

Answer:

1.a)1

2.a) group 2

3.a) na

4.b) p- block

5.c)

6.a)56

7.b)newlands

8.b)scandium