How many neutrons does an element have if its atomic number is 40 and its mass number is 154

I have had thoughts of running away ... because my love of my life gets out of jail soon, and my parents want to move. Should I run away when we move so I can see him and be with him?

Planets look like bright stars when they are viewed from Earth.

Why are viruses called obligate intracellular parasites?

Suppose you were preparing 1.0 L of a bleaching solution in a volumetric flask, and it calls for 0.21 mol of NaOCl. If all you had available was a jug of bleach that contained 0.

What might be damaged by ionizing radiation? * lead paper soft tissue

Alka-Seltzer is a solid mixture of two substances, sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7). The substances react to form water, carbon dioxide (CO2), and Na3C6H5O7.

Four properties of water are listed. 1. It is colorless and odorless in its pure form. 2. It reacts with metals to form metal hydroxide and hydrogen gas. 3. When heated to 100 °C, water evaporates. 4. It decomposes to form hydrogen and oxygen.

Water is A. Acidic B. Basic C. Neutral

What variables affect the acceleration of an object and in what manner do they affect the acceleration?

How do valence electrons relate to the chemical reactions of an element?