Element Na (Sodium) can be called as__________.
monoatomic
diatomic
polyatomic
triatomic
An element is termed as monoatomic, if it can exist independently as a single atom. For example, Na, Ne.
Question 29 Can the following groups of elements be classified as Dobereiner’s triad?
(a) Na, Si, Cl
(b) Be, Mg, Ca
Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40. Explain by giving reason.