Februarv 9, 20173bP Use the periodic table below bo helpamwer qwations #15, 16.
ID: 191372 • Letter: F
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Februarv 9, 20173bP Use the periodic table below bo helpamwer qwations #15, 16. 5) How many many elestrons does osygen ncod to fill its valence shell? does A) 1 B) 2 C)4 D) s 16) How many protoes does an años of carbon have in is nucleus C)8 D) 16 E) 32 17) The ionic bond of sodium chloride NaCh is formed when A) chlorine gains an electron and sodium loses an electron B) sodium and chlorine share two electrons C) sodium and chlorine both lose electrons from their outer valence shells D) chlorine gains a proton from sodium. E) chlorine gains a neutron from sodium 18) Amino acids are acids because they always possess which functional group? A) amino B) phosphate D) nucleotide E) side chain 19) A covalent chemical bond is one in which A) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both C) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms D) outer-shell electroms of one atoen are transferred to the inner electron shells of another E) the inner-shell electrons of one atom are trans ferred to the outer shell of another atomExplanation / Answer
15) Oxygen has the elcetronic configration as (2, 6). That means it contains two elcetrons in to its first rbit and 6 elctrons into outer orbit. Now to full fill the octate state it needs 2 electrons so it gains two electrons and fullfill the octate state. Hence it's valancy is 2.
Hence correct answer is (B).
16) All the carbon atoms have the 6 protons in the nucleus .
Hence option (B) is correct.
17) Sodium chloride (NaCl) in which sodium has electronic configration (2, 8, 1) and Chlorine has the elctronic configration as (2,8,7). Hence to it's easy to give a one elctron to chlorine to full fill the electronic configaration of chlorine. The bonde formed due to sharing of electrons between sodium and chlorine is called as ionic bond. So chlorine gains an electron from sodium. So sodium looses electron.
Hence option (A) is correct.
18) Covalent chemical bond in one in which the outer shell elctrons are shared by two atoms so as to satisfactorily fill the outer electron shells of both..
Hence option (C) is correct.
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