Question

Fill in the missing details in below table. use State type of mirror or lens used State position, nature and size of an image when object placed at distance equal to its focal length. Rear view in vehicles (a) (?) (b) (?) To observe minute parts of watch by watch repairer (C) (?) (d) (?) ​

Answer 1

Answer:

The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements. Every element in the first column (group one) has one electron in its outer shell