The number of protons, electrons and neutrons in a species are equal to 17, 18 and 18 respectively. Which of the following will be the proper symbol of this species?

Question

The number of protons, electrons and neutrons in a species are equal to 17, 18 and 18 respectively. Which of the following will be the proper symbol of this species? (A)  1735 C l (B)  1735 C l- (C)  1736 C l (D)  1736 C l-

Tardigrade Admin · Accepted Answer

p=17, e=18, n=18 means, Z=17 ⇒ element is chlorine, which contains one electron more (17+1), so it is chloride ion, Cl - ⇒ Symbol: 1735 Cl - Mass number, A=n+p=18+17=35 Atomic number, Z=17

Q. The number of protons, electrons and neutrons in a species are equal to $17, 18$ and $18$ respectively. Which of the following will be the proper symbol of this species?

$_{17}^{35} Cl$

$_{17}^{35} C l^{-}$

$_{17}^{36} Cl$

$_{17}^{36} C l^{-}$

$p = 17, e = 18, n = 18$
means, $Z = 17 \Rightarrow$ element is chlorine, which contains one electron more
$(17 + 1)$ , so it is chloride ion, $C l^{-}$
$\Rightarrow$ Symbol: $_{17}^{35} C l^{-}$
Mass number, $A = n + p = 18 + 17 = 35$
Atomic number, $Z = 17$

Q. The number of protons, electrons and neutrons in a species are equal to 17,18 and 18 respectively. Which of the following will be the proper symbol of this species?

1735​Cl

1735​Cl−

1736​Cl

1736​Cl−