Variation of Metallic Properties

Q. Choose the correct answer:
With reference to the variation of properties in the Periodic Table, which of the following is generally true?
(a) Atomic size increases from left to right across a period.
(b) Ionisation potential increases from left to right across a period.
(c) Electron affinity increases going down a group.
(d) Electronegativity increases going down a group.

Q.

Is lead metal or nonmetal?

Q.

Which of the following set of elements is written correctly in the order of their increasing metallic character?

(a) Mg, Al, Si (b) C, O, N (c) Na, Li, K (d) Be, Mg, Ca

Q.

Give two examples of metalloids.

Q. Compare the properties of a typical metal and a non-metal on the basis of the following:
(a) electronic configuration.
(b) nature of the oxides.
(c) oxidising or reducing action.
(d) conductivity of heat and electricity.

Q. The metallic character decreases down the group and increases along the period.

1. True
2. False

Q.

Name any three metalloids

Q.

From left to right in a period, metallic character gradually decreases.

1. True

2. False

Q. Question 26
Which of the following set of elements is written in order of their increasing metallic character?

(a) Be, Mg, Ca
(b) Na, Li, K
(c) Mg, Al, Si
(d) C, O, N

Q.

Given alongside is a part of the periodic table :

$\begin{array}{cccccccc}Li& Be& & B& C& N& O& F\\ Na& Mg& & Al& Si& P& S& Cl\end{array}$

As we move horizontally from left to right :

(i) What happens to the metallic character of the elements ?

(ii) What happens to the atomic size ?

Q.

What happens to the metallic character of the elements as we go down in a group of the periodic table?

Q.

Name:

(a) two metals which are liquid at room temperature,

(b) metal which do not corrode easily

(c) a metal which lacks ductility,

(d) a non-metal which is lustrous,

(e) a non-metal which conducts electricity,

(f) a metal which is brittle,

(g) two elements which are monoatomic,

(h) two metallic oxides which are acidic,

(i) two metallic oxides which are amphoteric,

(j) two metallic which react with cold water,

(k) the compound responsible for green deposit on the surface of copper,

(l) a non-metal which can form a positive ion,

(m) a non-metal which shows reducing property,

(n) a metal whose oxide is reduced only by carbon.

Q. Considering the atomic number and position in the periodic table, arrange the following elements in the increasing order of metallic character: $Si,Be,Mg,Na,P.$ [3 Marks]

Q. Which of the following element has the highest metallic nature?

1. Phosphorus
2. Sulpher
3. Oxygen
4. Nitrogen

Q.

Question 61
Explain the following:

(a) Reactivity of $\text{Al}$ decreases if it is dipped in ${\text{HNO}}_3$.
(b) Carbon cannot reduce the oxides of $\text{Na}$ or $\text{Mg}$.
(c) $\text{NaCl}$ is not a conductor of electricity in the solid state whereas it does conducts electricity in aqueous solution as well as in molten state.
(d) Iron articles are galvanised.
(e) Metals like $\text{Na, K, Ca}$ and $\text{Mg}$ are never found in their free state in nature.

Q.

Give answer for the following:

(i) Metal liquid at room temperature.

(ii) Non-metal that is a conductor of electricity.

(iii) Netural oxide.

(iv) Metallic oxide that cannot be reduced by hydrogen.

(v) Non-metal that has luster.

Q.

Rewrite the following statements after correction, if necessary :

(i) Elements in the same period have the equal valency

(ii) The metallic character of elements in a period increases gradually on moving from left to right.

Q. Which of the following element is most metallic?

1. P
2. Bi
3. As
4. Sb

Q.

Considering the elements B, C, N, F and Si, the correct order of their non-metallic character is:

1. B > C > Si > N > F

2. F > N > C > Si >B

3. Si > C > B > N > F

4. F > N > C > B > Si

Q.

Arrange the following elements in the increasing order of their metallic character :

Mg, Ca, K, Ga

Q. Question 6
By considering their position in the periodic table, which one of the following elements would you expect to have maximum metallic characteristic: Ga, Ge, As, Se, Be?

Q. In the periodic table, the elements having greater non-metallic character are placed at which corner of the periodic table?

1. Upper left
2. Center
3. Upper right
4. Lower left
5. Lower right

Q. Both metals and non-metals are found among ______ elements in the periodic table

1. p-block
2. d-block
3. transition
4. inner transition

Q.

The most metallic among the given elements is _______.

1. K

2. Ti

3. Ca

4. Sc

Q.

Which of the following is not a correct statement about the trends when going from left to right across the periods of the periodic table?

1. The elements become less metallic in nature.

2. The number of valence electrons increases.

3. The atoms lose their electrons more easily.

4. The oxides become more acidic.

Q.

Why are the halogens in group 7?

Q.

Do all metals react with bases to give H2 or all metals react to give H2?

Q. The metallic character of elements __________ in a group from top to bottom.

1. increases
2. decreases
3. remains constant
4. shows indefinite behaviour.

Q. Considering the elements $B,Al,Mg,K,$ the correct order of their metallic character is :

1. $B>Al>Mg>K$
2. $Al>Mg>B>K$
3. $Mg>Al>K>B$
4. $K>Mg>Al>B$

Q. Which of the following elements will form an acidic oxide?

1. An element with atomic number $7$
2. An element with atomic number $3$
3. An element with atomic number $19$
4. An element with atomic number $12$