Experts plz answer all of the 1 mark questions plz
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Answer:
Explanation:
Answer(1) But instead of seeing this as a problem, Mendeleev thought it simply meant that the elements which belonged in the gaps had not yet been discovered. He was also able to work out the atomic mass of the missing elements, and so predict their properties. And when they were discovered, Mendeleev turned out to be right.
Answer(2) To calculate the valency of an element(or molecule, for that matter), there are multiple methods. ... The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell.
Answer(3) Electronic configuration of element having atonic number 16= 2,8,6
as it has 6 electrons in it's valency cell so the valency==8-6=2 Ans
Answer(4) Valency in the periodic table across a period first increases and then decreases. There is no change going down a group. ... The valency does not change going down a group since the bonding behavior is not affected by the core electrons.
Answer(5) The valency of noble gases is zero because their octet is complete. Octet means that outer most orbit has complete eight electrons to stay stable. ... The noble gases are already stable, so their tendency to gain or lose electrons is zero. Hence, their valency is also zero.
Answer(6) as it has 8 electrons in it's outermost shell so it's octet is complete so it's valency would be zero(0).
Answer(7) Electronegativity depends on two factors mainly:
(1) Effective nuclear charge = Group no.
(2) Atomic radius.
The greater effective nuclear charge and the smaller the atomic radius the higher the electronegativity.
Across the Period, effective nuclear charge increases whereas atomic radius decreases. So electronegativity increases.
Down any Group effective nuclear charge remains the same but atomic radius incerases. So electronegativity decreases.
Answer(8) The present classification of element is Long form of perodic table . it was made by Henry moseley , it is based on electron configuration of elements.
HEY hope it gonna help you........................................