आधुनिक आवर्त सारणी में किस ब्लॉक के तत्व आम तौर पर सबसे कम विद्युत धनात्मक (least electropositive) लक्षण प्रदर्शित करते हैं?

The correct order of increasing metallic character of Na, Be, P, Mg and Si is:

Which of the following is the correct order of increasing atomic radii for nitrogen, oxygen, and fluorine?

Which of the following represents the correct increasing order of atomic radii for the elements fluorine (F), oxygen (O), and nitrogen (N)?