आधुनिक आवर्त सारणी के समूह संख्या 18 में निम्नलिखित में से कौन से तत्व शामिल 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)?