What would be the IUPAC name for an element with atomic number 222?

The electronic configuration of the elements A and B are 1s², 2s ²,2p⁶,3s² and 1s², 2s²,2p⁵ respectively. The formula of the ionic compound that can be formed between these elements is ___________

The first list of 23 chemical elements was published by _____ in the year 1789.

Which of the following is Dobereiner's triad?

What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

How would you explain the fact that the second ionisation potential is always higher than first ionisation potential?

Give the general electronic configuration of lanthanides and actinides.

How does atomic and ionic radii vary across the group and period.

Mandeleev predicted that elements with atomic weights 72.68 and 70 in group IV and their properties. Name the elements that were discovered later and have properties predicted by Mandeleev.

Write the general electronic configuration of S-, p-, d-, and f-block elements?

Define modern periodic law.

Justify that the fifth period of the periodic table should have 18 elements on the basis of quantum numbers.

Why halogens act as oxidising agents?

Name the third chalcogen and fifth noble gas

Lanthanoids and actinoids are placed in separate rows at the bottom of the periodic table. Explain.

Helium has a electronic configuration of 1s² but placed in p block in group 18. Justify.

Justify the given statement with suitable examples "the properties of the elements are a periodic function of their atomic numbers".

State the trends in the variation of electronegativity in group and periods.

Give the structural features of modern periodic law.

Explain the merits of Moseley's long form of periodic table.