Question

What is the cause of periodicity amongst
elements in Modern periodic table?​

Answer 1

The cause of periodicity is the recurrence of similar electronic configuration i.e. same number of electrons in the outermost orbit.In a particular group, electrons in the outermost orbit remain the same i.e. electronic configuration is similar.

Answer 2

Explanation:

Protein foods

lean meats – beef, lamb, veal, pork, kangaroo.

poultry – chicken, turkey, duck, emu, goose, bush birds.

fish and seafood – fish, prawns, crab, lobster, mussels, oysters, scallops, clams.

eggs.

dairy products – milk, yoghurt (especially Greek yoghurt), cheese (especially cottage cheese)