Question

In the table

Proton	Electron	Charge
23	X	+3
46	43	Y

$X$ and $y$ are

• A. $20,-3$
• B. $20,+3$
• C. $26,-3$
• D. none of these

Answer 1

Answer: (B)

Atomic number $=$ number of protons
No. of electrons in positive ion $=$ no. of proton $-$ no. of $+ve$ charge on ion
No. of electrons in negative ion $=$ no. of- proton $+$ no. of $-ve$ charge on ion
(No. of electrons) $X=23-3=20$
(No. of charge) $Y=46-43=+3$