What is the key element fountain all carbohydrates lipids proteins and nucleus acid

Read the given expression. x = number of protons − number of core electrons which of the following explains the identity of x and its trends across a period? x is the effective nuclear charge, and it remains constant across a period. x is the screening constant, and it remains constant across a period. x is the effective nuclear charge, and it increases across a period. x is the screening constant, and it increases across a period.

What’s a special glass that most beakers are made of

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?