Question

Lithium, sodium and potassium were put in one Group on the basis of their similar properties. What are those similar properties?

Answer 1

1. Valence electrons of any element are the number of electrons present in the outermost shell of any element. Valence electrons in any element can be predicted by their Group number. For example, elements in Group 1 have 1 valence electron.
2. The electronegativity of an atom in a bond is the ability of that atom to attract the bonded electrons towards itself. Electronegativity increases from left to right in the Period due to a decrease in the atomic size on moving toward right in the Period. Electropositivity is the reverse of electronegativity.
3. Valency of any element is the tendency of any element to accept or lose electrons to form a molecule with another element. Elements with valence electrons 1, 2, 3, and 4 have their valency 1, 2, 3, and 4 respectively.
4. Similar properties among Lithium (Li), Sodium (Na), and Potassium (K) are:

• All three have 1 valence electron.
• All three are electropositive in nature.
• All three are monovalent in nature that is the value of valency of both the elements is 1.