Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Refer to the Periodic table and identify a highly reactive metal in the sixth period.

A
$$Cs$$

B
$$W$$

C
$$Os$$

D
$$Ir$$

Solution

As we move from left to right along a period, metal activity decreases. So here "$$Cs$$" (alkali metal) is a highly reactive metal in the sixth period.

All others are d-block elements so they are less reactive than $$Cs$$.
Question 2
1 / -0

Recently (in 2003) element with atomic number $$110$$ has been named by IUPAC as:

A
$$Hs$$

B
$$Mt$$

C
$$Ds$$

D
$$Sg$$

Solution

Element $$110$$ being named darmstadtium with symbol $$Ds$$ by IUPAC.
Question 3
1 / -0

Which pair is different from the others?

A
$$Li-Mg$$

B
$$B-Si$$

C
$$Be-Al$$

D
$$Li-Na$$

Solution

$$Li-Na$$ belongs to same group but all other pair have diagonal relationship.
Question 4
1 / -0

Use the following system of naming elements in which first alphabets of the digits are written collectively,
0 1 2 3 4 5 6 7 8 9
nil uni bi tri quad pent hex sept oct enn
Write three-letter symbol for the elements with atomic number $$106$$.

A
uh

B
unh

C
uunhe

D
unhex

Solution

Digit
1
0
6
Symbol
Uni
nil hex
First alphabate
u n
h
The three-letter symbol for the elements with the atomic number $$106$$ is unh.
Question 5
1 / -0

The element $$119$$ has not been discovered. What would be the symbol for this element?

A
$$Uue$$

B
$$UUe$$

C
$$UUE$$

D
None of these

Solution

Ununennium is also known as eka-francium or simply element $$119$$.

It is a hypothetical chemical element with the atomic number $$119$$. Its symbol is $$Uue$$.

So, the correct answer is (A)
Question 6
1 / -0

Which of the following will have maximum electron affinity?

A
$$1s^2 2s^2 2p^5$$

B
$$1s^2 2s^2 2p^6$$

C
$$1s^2 2s^2 2p^6 3s^2 3p^5$$

D
$$1s^2 2s^2 2p^6 3s^2 3p^6$$

Solution

$$1s^2 2s^2 2p^6 3s^2 3p^5$$ is the electron afinity of chlorine

In $$Cl$$, there are empty d-orbitals where it can accommodate its electron and because of this, attraction forces increases and electron affinity also. So, $$Cl$$ has the highest electron affinity.

Hence, the correct option is $$\text{C}$$
Question 7
1 / -0

Among the following element having the most negative electron affinity is:

A
Br

B
Sn

C
Ba

D
Li

Solution

Electron affinity of non metals is highest negative. Here, apart from Br all are metals. So, Br has most negative electron affinity.
Question 8
1 / -0

Which one is the most electronegative element in the periodic table?

A
$$F$$

B
$$Cl$$

C
$$Ne$$

D
None of these

Solution

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.
The Pauling scale is the most commonly used. Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to caesium and francium which are the least electronegative at 0.7.
So, answer is option A.
Question 9
1 / -0

Recently (in Aug 2003) two new elements have been discovered with atomic number:

A
$$113, 114$$

B
$$114, 115$$

C
$$115, 116$$

D
$$113, 115$$

Solution

Two superheavy elements, elements $$113$$ and $$115$$, were recently synthesized through a collaborative effort between scientists from the Physical and Life Sciences Directorate at the Lawrence Livermore National Laboratory and researchers from the Joint Institute for Nuclear Research at the Flerov Laboratory for Nuclear Reactions in Dubna, Russia.
Question 10
1 / -0

Recently discovered element with atomic number $$ 115$$ is:

A
$$Uun$$

B
$$Uub$$

C
$$Uup$$

D
$$Uus$$

Solution

1 - Un
1 - Un
5- Pent
So the name of element with atomic number 115 is Ununpentium.
It is recently discovered element with atomic number 115 is Uup. It corresponds to Ununpentium which is transuranic element. It is synthetic, radioactive element with a short half-life.
Hence,option C is correct.

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0	1	2	3	4	5	6	7	8	9
nil	uni	bi	tri	quad	pent	hex	sept	oct	enn

Digit	1	0	6
Symbol	Uni	nil	hex
First alphabate	u	n	h

Classification of Elements and Periodicity in Properties Test - 29

Result

Classification of Elements and Periodicity in Properties Test - 29

Score

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SHARING IS CARING

Question 1

$$Cs$$

$$W$$

$$Os$$

$$Ir$$

Solution

Question 2

$$Hs$$

$$Mt$$

$$Ds$$

$$Sg$$

Solution

Question 3

$$Li-Mg$$

$$B-Si$$

$$Be-Al$$

$$Li-Na$$

Solution

Question 4

uh

unh

uunhe

unhex

Solution

Question 5

$$Uue$$

$$UUe$$

$$UUE$$

None of these

Solution

Question 6

$$1s^2 2s^2 2p^5$$

$$1s^2 2s^2 2p^6$$

$$1s^2 2s^2 2p^6 3s^2 3p^5$$

$$1s^2 2s^2 2p^6 3s^2 3p^6$$

Solution

Question 7

Br

Sn

Ba

Li

Solution

Question 8

$$F$$

$$Cl$$

$$Ne$$

None of these

Solution

Question 9

$$113, 114$$

$$114, 115$$

$$115, 116$$

$$113, 115$$

Solution

Question 10

$$Uun$$

$$Uub$$

$$Uup$$

$$Uus$$

Solution

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