10.(i)Elements from A to F have in them the distribution of electrons, neutrons and protons
as follows:
Atoms/ions Number of Electrons Number of Neutrons Number of Protons
A
B
C
D
E
F
4
10
17
17
18
19
4
12
18
20
22
21
3
11
17
17
18
19
Making use of these data, find
(a) a pair of ions
(b) an atom of a noble gas
(c) a pair of isobars
d) a pair of isotopes
(ii)Calculate the average atomic mass of chlorine if it exists commonly in two
isotopes.17Cl35 (75%) and 17Cl37 (25%
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Answer:
Explanation:
The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass. For hydrogen, the atomic mass is 1 because there is one proton and no neutrons. For helium, it is 4: two protons and two neutrons.
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2.1 Electrons, Protons, Neutrons, and Atoms.
Element .
Symbol .
Atomic No. .
Number of Electrons in Each Shell First .
Second .
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