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Chemistry
Periodic table
The atom having smallest size in the list below is
Na, Si, Cl, Ar
(A) Na
(B) Cl
(C) Si
(D) Ar

Chemistry
Periodic table
An element has an atomic number of $15$ with which of the following elements will it show similar chemical properties?
(A) $Be\left( 4 \right)$
(B) $Ne\left( {10} \right)$
(C) $N\left( 7 \right)$
(D) $O\left( 8 \right)$

Chemistry
Periodic table
Which of the following is the correct formula for a compound of scandium and oxygen?
A. $S{c_2}O$
B. $ScO$
C. $S{c_3}{O_2}$
D. $S{c_2}{O_3}$

Chemistry
Periodic table
What is the particle that determines the identity of an element?

Chemistry
Periodic table
Which of two elements among the following will display the most similar chemical properties?
(A) aluminium calcium
(B) nickel phosphorous
(C) chlorine sulphur
(D) carbon sulphur
(E) Lithium and potassium

Chemistry
Periodic table
The electronic configuration of an element is $'X'$ is $2,8,6$ . To which group and period of the modern periodic table do $'X'$ belong, state its valency and justify your answer in each case.

Chemistry
Periodic table
An atom of which element has $47$ protons in its nucleus?

Chemistry
Periodic table
Which periodic group forms +1 ; +2 and -1 ions?

Chemistry
Periodic table
What formula represents strontium phosphate?
Chemistry
Periodic table
Which of the following alkali metal halides has the lowest lattice energy?
(A) $LiF$
(B) $NaCl$
(C) $KBr$
(D) $CsI$
Chemistry
Periodic table
Which of the following has the lowest density?
(A) Oxygen
(B) Hydrogen
(C) Neon
(D) Carbon
Chemistry
Periodic table
Which of the following is an element?
(A) Aluminum
(B) Methane
(C) Hydrogen peroxide
(D) All of the above
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