सोडियम परिवार के तत्वों (समूह 1 के तत्व) को निम्नलिखित में से किस नाम से भी जाना जाता है?

Which of the following elements does NOT belong to the 2nd period of the periodic table?

An element with atomic number 14 is hard, forms an acidic oxide, and forms covalent halides. To which category does this element belong?

The modern periodic table is based on which of the following properties of elements?

The correct order of magnitude of electron gain enthalpy for halogens is:

The correct order of ionic radii for the following ions is: O2-, F-, Na+, Mg2+