Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 43

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following electronic configuration is incorrect?

A
Be (4) = 2, 2

B
O (8) = 2, 6

C
S (16) = 2, 6, 8

D
P (15) = 2, 8, 5

Solution

Shell

$$K$$

$$L$$

$$M$$

$$N$$

Maximum number of students

$$2$$

$$8$$

$$18$$

$$32$$

Thus, electrons are filled in shells in the above manner. So,
For $$Be$$ : $$Z$$ = $$4$$ ; $$K$$ = $$2$$; $$L$$ = $$2$$
For $$O$$ : $$Z$$ = $$8$$ ; $$K$$ = $$2$$; $$L$$ = $$6$$
For $$S$$ : $$Z$$ : $$16$$ ; $$K$$ = $$2$$; $$L$$ = $$8$$; $$M$$ = $$6$$
For $$P$$ : $$Z$$ = $$15$$ ; $$K$$ = $$2$$; $$L$$ = $$8$$; $$M$$ = $$5$$
Question 2
1 / -0

A, B, C are three elements with atomic numbers, Z-1, Z, and Z+1 respectively. B is an inert gas other than helium. Which of the three has large negative value of electron gain enthalpy?

A
A

B
B

C
C

D
Cannot be predicted.
Question 3
1 / -0

Atomic radii of 3 non-metals $$A, B, C$$ belonging to the same group are $$A < B < C$$. Predict the order of electron affinity values.

A
$$A > B > C$$

B
$$A < B < C$$

C
$$A < B > C$$

D
$$A > B < C$$

Solution

Electron affinity is the ability of an atom to accept an electron. Electron affinity generally decreases down a group of elements because each atom is larger than the atom above it. This means that an added electron is further away from the atom's nucleus compared with its position in the smaller atom.

Hence the order is $$A>B>C$$.
Question 4
1 / -0

Regardless of its electron configuration, it must always be paramagnetic when it's a single, neutrally charged atom. Which of the following is this?

A
Carbon

B
Nitrogen

C
Oxygen

D
Neon

E
Argon

Solution

Nitrogen has an atomic number of $$7$$. It's electronic configuration is $$1s^22s^22p^3$$. Nitrogen has $$3$$ unpaired electrons. Each of the $$3$$ orbitals of the p-subshell are singly occupied by these $$3$$ electrons.
Now, from the image, we see that, since nitrogen has $$3$$ unpaired electrons in 3 orbitals of p-subshell, the nitrogen atom is paramagnetic.
Option $$B$$ is the correct answer.
Question 5
1 / -0

Assertion : Element number $$12$$ and element number $$20$$ undergo similar chemical reactions
Reason : Element number $$12$$ and element number $$20$$ have similar valence electron configuration

A
Both assertion and reason are correct and reason is the correct explanation for assertion

B
Both assertion and reason are correct but reason is not the correct explanation for assertion

C
Assertion is correct but reason is incorrect

D
Assertion is incorrect but reason is correct

E
Both assertion and reason are incorrect

Solution

Both have two electrons in the valence shell. They lose these two electrons to form a di-positive cation.
Hence, both the assertion and reason are correct and reason is the correct explanation for an assertion.
Question 6
1 / -0

Within a period the elements having the lowest electron affinity are:

A
halogens

B
actinides

C
transition metals

D
group 1A alkali metals

Solution

Alkali metal elements have less valence electrons(only one) in their atoms , hence they least likely will to gain electrons. Electron affinity decreases down the groups and from right to left across the periods on the periodic tablebecause the electrons are placed in a higher energy level far from the nucleus, thus a decrease from its pull.
Question 7
1 / -0

The electronic configuration of chloride ion is:

A
$$2,8,7$$

B
$$2,8,6$$

C
$$2,8,8$$

D
$$2,8$$

Solution

The electronic configuration of $$chlorine$$ atom is $$\displaystyle 2,8,7$$. It gains one electron to form $$chloride$$ ion.

The electronic configuration of $$chloride$$ ion is $$\displaystyle 2,8,8.$$
Question 8
1 / -0

Which of these metals would be most reactive?

A
$$K$$

B
$$Ca$$

C
$$Ti$$

D
$$Mn$$

E
$$Cu$$

Solution

Elements og group 1 are most reactive as they have one extra electron in s=their outer most shell, they can readily donate it.
Question 9
1 / -0

Which of the following has the greatest affinity for electrons?

A
$$Na$$

B
$$Cl$$

C
$$Br$$

D
$$K$$

E
$$C$$

Solution

Option $$B$$ is the correct answer.
The atomic number of $${Cl} $$ is 17, which can be written as (2,8,7). Thus, there are 7 electrons in the outermost shell. Every element wants to go to their nearest inert gas structure to attain stability. Thus, Chlorine wants to attain its nearest inert gas Argon's structure by accepting one more electron in its outermost shell, thus converting its electronic configuration to (2,8,8). And it is very easy for Chlorine too, as it has to accept only one electron.
Thus $${Cl}$$ has the greatest affinity for electrons.
Question 10
1 / -0

Which element has the largest electron affinity?

A
$$Cl$$

B
$$Mo$$

C
$$Cs$$

D
$$Ge$$

E
$$Ag$$

Solution

Chlorine has largest electron affinity, as EA increases across a period and decrease down the group.

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Shell	$$K$$	$$L$$	$$M$$	$$N$$
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Classification of Elements and Periodicity in Properties Test - 43

Result

Classification of Elements and Periodicity in Properties Test - 43

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SHARING IS CARING

Question 1

Be (4) = 2, 2

O (8) = 2, 6

S (16) = 2, 6, 8

P (15) = 2, 8, 5

Solution

Question 2

A

B

C

Cannot be predicted.

Question 3

$$A > B > C$$

$$A < B < C$$

$$A < B > C$$

$$A > B < C$$

Solution

Question 4

Carbon

Nitrogen

Oxygen

Neon

Argon

Solution

Question 5

Both assertion and reason are correct and reason is the correct explanation for assertion

Both assertion and reason are correct but reason is not the correct explanation for assertion

Assertion is correct but reason is incorrect

Assertion is incorrect but reason is correct

Both assertion and reason are incorrect

Solution

Question 6

halogens

actinides

transition metals

group 1A alkali metals

Solution

Question 7

$$2,8,7$$

$$2,8,6$$

$$2,8,8$$

$$2,8$$

Solution

Question 8

$$K$$

$$Ca$$

$$Ti$$

$$Mn$$

$$Cu$$

Solution

Question 9

$$Na$$

$$Cl$$

$$Br$$

$$K$$

$$C$$

Solution

Question 10

$$Cl$$

$$Mo$$

$$Cs$$

$$Ge$$

$$Ag$$

Solution

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