Which one of the following is a correct electronic configuration of sodium ?
$2, \,8$
$2, \,8,\,1$
$2,\,1, \,8$
$8,\,2, \,1$
Number of valence electrons in $Cl^-$ ion are :
Define valency by taking examples of silicon and oxygen.
If number of electrons in an atom is $8$ and number of protons is also $8$, then $(i)$ what is the atomic number of the atom ? and $(ii)$ what is the charge on the atom ?
For the following statements, write $T$ for True and $F$ for False.
$(a)$ J.J. Thomson proposed that the nucleus of an atom contains only nucleons.
$(b)$ A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.
$(c)$ The mass of an electron is about $\frac {1}{ 2000}$ times that of proton.
$(d)$ An isotope of iodine is used for making tincture iodine, which is used as a medicine.
If an atom contains one electron and one proton, will it carry any charge or not ?
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