Answer:
A double displacement is a type of chemical reaction that in which the reactant ions exchange places to form new products
Explanation:
I took the quiz
Temperature is the average amount of energy of motion of each particle of a substance<span>. That is, temperature is a measure of how hot or cold a </span>substance<span> is. In contrast, the total </span>energy of motion<span> in the </span>particles of a substance is called<span> thermal</span>energy<span>.</span>
20 Ca :
1s², 2s², 2p⁶, 3s², 3p⁶, 4s²<span>
</span>
Answer D
hope this helps!
Both indicate the temperature at which the solid and liquid states of a substance are in equilibrium would be your answer.
This is beacause the melting point of a substance is the same as the freezing point of a substance. At this particular temp, the substance can be either a solid or a liquid.
hope this helps!
Answer: protons and neutrons.
The nucleus is made up of 3 subatomic particles that are protons,neutrons and electrons.
General notation of an element is 
where, X is the Element, A is the Atomic Mass and Z is the Atomic Number
If we know the number of protons we can easily find out the atomic number of any element because Atomic Number = Number of protons in an element.
And in addition if we know the number of neutrons we can easily find out the atomic mass of an element because
Atomic Mass = (Number of protons) + (Number of neutrons)
If we get to know the atomic number and atomic mass, we can easily tell what element is it by looking from the periodic table.