9. Electrons determine the chemical reactivity of an atom A) True B) False C) no
ID: 575673 • Letter: 9
Question
9. Electrons determine the chemical reactivity of an atom A) True B) False C) none of the above 10. K and NH are examples of A) Anion B) Cation C) A and B d) none of the above 11. Protons and neutrons are housed in the nucleus of an atom A) Faise Bi True C) none of the above 12. The number of electrons in CI is the same as in Ct A) True B) False C) none of the above 13. One can essentially determine the atomic mass of an atom if the number of electrons and neutrons is known A) False B) True C) none of the above 14. The entity formed when Ca loses two electrons is A) Ca B) Ca C) 2Ca D) Ca 15. The entity formed when Ba" and PO react is A) Ba (PO) B) Ba(PO.) C)Ba (PO D) none of the above 16. The mass of a proton is slightly higher than the mass of a neutron A) True B) False C) none Of the above 17. An atom is A) capable of independent existence B) not capable of independent existence C A and B D) none of the above. stan stm Al diftfor in mace R differ in charge C) differ inExplanation / Answer
9. True, Total no of electrons affects the reactivity. Ex : odd no of electrons causes paramagnetism while even no of electrons cause diamagmetism
10. Cation, are those which has positive charge on it
11. True, protons and neutron are fundamental particles and present in nucleus
12. False, since Cl-17 & Cl- -18, anions have more electrons than it's parent element.
13. False, atomic mass = no of protons +no of neutrons
14. Ca+2 , bivalent cation, since valency of Ca is two
15. Option B, according to Criss - Cross method, Ba3(PO4)2
16. False, neutron(1.00826 amu) has more than proton (1.007277 amu)
17. Option B, with exception of Noble gases.
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