How can this product be achieved using the starting material shown?

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.

The excretory system, need answers for all: )

What substance has a mass of 9.5g and volume of 2.1cm^3