Answer:
Anything not on the periodic table is an element non example! ... So, for a substance to be an element, all of its atoms must have the same number of protons. Examples of elements include hydrogen, lithium, nickel, and radium.
Explanation:
Explanation:
reaction cannot be both endothermic and exothermic at the same time.
Answer:
aluminum is highly reactive
NaCI this wht forms when sodium and choride combine
