Question

Why does oxygen lie in the second period ? (For Std 10)

Answer 1

Answer:

The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. In a quantum mechanical description of atomic structure, this period corresponds to the filling of the second (n = 2) shell, more specifically its 2s and 2p subshells. Period 2 elements obey the octet rule in that they need eight electrons to complete their valence shell, where at most eight electrons can be accommodated: two in the 2s orbital and six in the 2p subshell.

Explanation:

hope it helps you

plzz mark me as ur brainliast ❤️❤️

plzz follow me ❤️❤️❤️

Answer 2

✨✨Answer is here✨✨

➡️✨✨the period number of an element indicates how many of its energy levels house electrons. ... The elements in a group often look and behave similarly, because they have the same number of electrons in their outermost shell — the face they show to the world.✨✨

✔️✔️