Periodic Classi...

Match the following with correct response.
(1) An element belongs to group 13 and 3 period
(2) Eka silicon
(3)Atomic number 31
(4) An element constitution of chlorophyll

(A) Gallium
(B) Aluminium
(C) magnesium
(D) Germanium

Match the following with correct response.
(1) The most electronegative element
(2) The most electropositive element
(3) Element belonging to noble gas family
(4) Element constitute large member of organic compounds

(A) Carbon
(B) Lithium
(C) Fluorine
(D) Neon

Match the following with correct response.
(1) Element with 2 valence electrons
(2) Element with completely filled outer most shell
(3) Element with 1 valence electron
(4) Element without neutrons

(A) Calcium
(B) Potassium
(C) Neon
(D) Hydrogen

Match the following with correct response.
(1) Ionization energy in groups
(2) Atomic size in groups
(3) Metals
(4) Non-metals

(A) Increases
(B) Electronegative
(C) Electropositive
(D) Decreases

Which is true about noble gases?
A. The do not react with other elements
B. They have completely filled outer most shells
C. Xenon is most reactive noble gas
D. Most of the them are radioactive

Which of the following is isoelectric with O²⁻

A. N³⁻
B. Na⁺
C. F⁻
D. Ti⁺

Which of following statement is correct about isotopes?
A. Isotopes of an element have same atomic masses
B. Isotopes of an element have same atomic number
C. Isotopes of an element have same chemical properties
D. isotopes of and element have different atomic numbers

Which of the following is an example of Dobereiner's  triad?
A. Li, Na, K                                            
B. Cl, Br, I
C. Na, Mg, Al.
D. F, I, Br

Which of the pairs of elements are members of the same group.
A. Na and K
B. Ar and Cl
C. Mg and Ca
D. O and S

Which of following statements is not true about hydrogen?
A. Oxides of hydrogen is neutral
B. it is placed in group 1 and Period 1
C. It is a metal
D. It has 1 electron, Proton and neutron