MCQ
Nucleons are equal to :
- ANumber of electrons in an atom
- BNumber of protons in the nucleus
- CNumber of neutrons in the nucelus
- ✓Number of protons and neutrons in the nucleus
eg: If the given atom or isotope is $He _2^4 He _{ Z }^{ A }$
$Z=2$ Number of protons
$A=4$ Number of nucleons
$A - Z =4-2=2$ Number of neutrons
Hence nucleons $=$ number of $[$ protons $+$ neutrons $]$
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| Aspects | Metal |
| $(a)$ The metal which reveals a maximum number of oxidation states | $(i)$ Scandium |
| $(b)$ The metal although placed in $3 d$ block is considered not as a transition element | $(ii)$ Copper |
| $(c)$ The metal which does not exhibit variable oxidation states | $(iii)$ Manganese |
| $(d)$ The metal which in $+1$ oxidation state in aqueous solution undergoes disproportionation | $(iv)$ Zinc |
Select the correct option