What is a ion?
a. an atom with a different number of neutrons
b. an atom with a positive or negative charge
c. a molecule whose name has no charge
d. a molecule that does not have any bonds

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Why is the structure of molecule important to its function?