Similarity and Difference of Hydrogen with Alkali Metals

Q. Total number of non metal?

Q.

In what respect does hydrogen differ from :

(i) alkali metals (ii) halogens ?

Q. A hydrogen is similar to alkali metals as it forms halides with the formula .

1. HX
2. $H_{2}X$
3. ${\mathrm{HX}}_2$

Q.

Hydrogen shows characteristics similar to elements of which of the following group/groups

1. Alkaline earth metals

2. Alkali Metals

3. Halogens

4. Nobel Gases

Q. Question 43 (b)
A element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.
Classify X and Y as metal (s), non-metal (s) or metalloid (s)

Q. Which is the element with atomic number 57

Q.

The metals of s-block elements combine directly with halogens (X) at appropriate temperature to form halides of the

1. and type

2. and type

3. and type

4. and type

Q.

Pick out the correct element from the following:

(i) C (ii) Si (iii) Pb (iv) Ge

1. (i) and (ii)

2. (ii) and (iv)

3. (ii) and (iii)

4. (i) and (iv)

Q.

Hydrogen shows characteristics similar to elements of which of the following group/groups

1. Alkali Metals

2. Alkaline earth metals

3. Halogens

4. Nobel Gases

Q. Select the elements with which hydrogen shows similartities in properties.

1. $Na$
2. $K$
3. $Ca$
4. $Cl$
5. $Li$
6. $F$
7. $O$
8. $S$

Q. The oxidizing capacity of the third period elements (up to halogens) increases across a period. Explain.

Q.

why is hydrogen called both a metal and a non metal?

Q.

Give the chemical name and molecular formula for two homoatomic molecules found in air.