Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Mendeleev used a Sanskrit numeral before the names of the predicted elements. What was the term used for it?

A
Sasi

B
Eka

C
Astan

D
Pancan

Solution

A Sanskrit numeral used before the names of the predicted elements was Eka which means one.
Question 2
1 / -0

The electronic configuration of sulphur is :

A
$$K(2), L(8), M(6)$$

B
$$K(2), L(8), M(8)$$

C
$$K(2), L(6)$$

D
$$K(2), L(8)$$

Solution

Atomic number of sulphur = $$16$$
Therefore number of electrons = $$16$$
Thus, electronic configuration of sulphur $$K(2), L(8), M(6)$$
Number of orbit in sulphur = $$3$$
Question 3
1 / -0

Which periods were not divided into two series in the Mendeleev's periodic table?

A
$$4$$

B
$$5$$

C
$$6$$

D
None of the above

Solution

$$4^{th}$$, $$5^{th}$$ and $$6^{th}$$ period were divided into two series i.e first series and second series.
Question 4
1 / -0

Reactivity of elements ........ down the group.

A
increases

B
decreases

C
increases and then decreases

D
decreases and then increases

Solution

Reactivity of elements increases down the group as down the group number of shells increases and thus nuclear pull on the outermost electrons decreases.
Question 5
1 / -0

An atom has electronic configuration $$2,\,8,\,7$$. To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses)

A
N$$(7)$$

B
F$$(9)$$

C
P$$(15)$$

D
Ar$$(18)$$

Solution

The electronic configuration of F is $$2,\,7$$. The outermost shell of both chlorine and fluorine has $$7$$ electrons. Therefore, they are chemically similar.
Question 6
1 / -0

Reactivity of elements .............. across a period.

A
increases

B
decreases

C
increases and then decreases

D
decreases and then increases

Solution

In METALS reactivity DECREASES as you go ACROSS a Period because though they still want to give away valence electrons they have more of them to get rid of, which requires more energy.
In NON-METALS reactivity INCREASES as you go ACROSS a Period because the closer you get to fulling your s- and p- orbitals the more motivated you are to do so.
Question 7
1 / -0

The smallest period in the modern periodic table contains ............ elements.

A
$$2$$

B
$$4$$

C
$$8$$

D
$$16$$

Solution

The smallest period in the modern periodic table is Period-1 which contains only $$2$$ elements, i.e. $$H$$ and $$He$$.

Option (A) is correct.
Question 8
1 / -0

On moving across a period, the tendency to gain electrons:

A
decreases.

B
increases.

C
increases and then decreases.

D
decreases and then increases.

Solution

On moving across a period from left to right, the tendency to gain electrons increases as the non-metallic character increases.
Question 9
1 / -0

The sum of the number of elements of fifth and sixth period is :

A
$$48$$

B
$$50$$

C
$$52$$

D
$$54$$

Solution

The fifth period contains $$18$$ elements. The sixth period contains $$32$$ elements. Total is $$50$$ elements.
Question 10
1 / -0

In the Modern periodic table, calcium (atomic number $$20$$) is surrounded by elements with atomic numbers $$12,\,19,\,21,\,38$$. Which of these have physical and chemical properties resembling calcium?

A
$$21$$ and $$38$$

B
$$19$$ and $$21$$

C
$$12$$ and $$19$$

D
$$12$$ and $$38$$

Solution

The valence shell of $$12$$ and $$38$$ contains $$2$$ electrons in its outermost shell. They lie on the same group. Therefore, they will have physical and chemical properties resembling calcium.

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Re-Attempt Weekly Quiz Competition

Classification of Elements and Periodicity in Properties Test - 17

Result

Classification of Elements and Periodicity in Properties Test - 17

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Question 1

Sasi

Eka

Astan

Pancan

Solution

Question 2

$$K(2), L(8), M(6)$$

$$K(2), L(8), M(8)$$

$$K(2), L(6)$$

$$K(2), L(8)$$

Solution

Question 3

$$4$$

$$5$$

$$6$$

None of the above

Solution

Question 4

increases

decreases

increases and then decreases

decreases and then increases

Solution

Question 5

N$$(7)$$

F$$(9)$$

P$$(15)$$

Ar$$(18)$$

Solution

Question 6

increases

decreases

increases and then decreases

decreases and then increases

Solution

Question 7

$$2$$

$$4$$

$$8$$

$$16$$

Solution

Question 8

decreases.

increases.

increases and then decreases.

decreases and then increases.

Solution

Question 9

$$48$$

$$50$$

$$52$$

$$54$$

Solution

Question 10

$$21$$ and $$38$$

$$19$$ and $$21$$

$$12$$ and $$19$$

$$12$$ and $$38$$

Solution

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