Question

(15) What was the limitation of classification of elements in periodic table of Mendeleev ?

(A) He could not give fixed position to Hydrogen in periodic table

(B) It was a challenge for Mendeleev the arrangement of isotopes of element

(C) For some elements going from one element to other element, atomic mass was not increasing
in regular way
(D) All three


(16) In periodic table of Mendeleev why noble gases elements were not given position at the time of

arrangement because.........

(A) These gases were discovered late as they are inert

(B) Their amount is very less in the atmosphere

(C) (A) and (B) both

(D) During that their atomic mass were not known


(17) Which scientist stated that the atomic number (Z) of an element is a more fundamental property

than its atomic masses ?

(A) Henry Moseley (B) Newland (C) Dobereiner (D) All three given

Which of the following is the modern periodic law ?

(A) Properties of elements are a periodic function of their atomic number

(B) Properties of elements are a periodic function of their atomic mass

(C) Properties of elements are a periodic function of their chemical properties

(D) Properties of elements are a periodic function of their isotopes


(18) How was the classification of elements done in modern periodic table ?

(A) 6 periods and 8 group (B) 6 periods and 18 group

(C) 7 periods and 8 group (D) 7 periods and 18 group


(19) The maximum number of electrons that can be accommodated in a shell depends on the formula

.........

(A) n

2

(B) 2n

2

(C) 3n

2

(D) 4n

2


(20) How many maximum electrons are present in K shell ?

(A) 2 (B) 8 (C) 18 (D) 32


(21) How many maximum electrons can be accommodated in L shell ?

(A) 2 (B) 8 (C) 18 (D) 32


(22) Maximum how many electrons can be accommodated in M shell ?

(A) 2 (B) 8 (C) 18 (D) 32


(23)Maximum how many electrons can be accomodated in N shell ?

(A) 2 (B) 8 (C) 18 (D) 32


(24) By what name number of valence electrons in outermost shell of any atom is known ?

(A) Valence (B) Outermost electron

(C) Period number (D) Position of atom in group


(25) By what name the distance between the centre of the nucleus and outermost shell of an isolated

atom is known ?

(A) Valency (B) Atomic size (C) Molecular size (D) None of these


(26) 1 Picometre means = ..........

(A) 10–10 m (B) 10–9 m (C) 10–12 m (D) 1012 m


(27) What happens in moving from left to right along a period ?

(A) increases (B) decreases

(C) no change is occured (D) decreases and increases


(28) What change is seen in any group moving up to down ?

(A) increases (B) decreases

(C) no change occurs (D) decreases and then increases


(29) Which of the following metals is known as semi metal or metalloid ?

(A) Boron (B) Silicon (C) Arsenic (D) all given​

Answer 1

Answer:

the above answer is to be a good answer