D. acceleration
Explanation:
When an object's speed and direction are known, its acceleration can also be determined.
Acceleration is defined as the change in velocity of a body in motion with time.
Most times, velocity and speed can be changed if the direction a body is traveling is known.
Acceleration = 
The S.I unit of acceleration is always expressed as m/s²
Learn more:
Acceleration brainly.com/question/3820012
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The mass of a proton is approximately equal to the mass a neutron
Answer: 2 V + 5 F2 > 2 V+5 + 10 F-
Explanation: First balance the chemical eq.
V + F2 > V+5 + 2F-
Second: Identify which is oxidised and reduced.
Oxidation: increase in oxidation #
Reduction : decrease in oxidation #
Third do half-reaction
Ox. V > V5+
Red. F2. > 2F-
Next add electrons to each positive sides of the reaction
Ox. V > V5+ + 5e-
Red. F2 + 2e- > 2F-
To make the number of electrons equal we will multiply the ox. side by 2 and reduction side by 5
2 ( V > V5+ + 5e-)
5 ( F2 + 2e- > 2F-)
The result will be:
2V + 5F2 + 10e > 2V5+ + 10e + 10 F-
Cancel the 10e in both sides.
Then the result will have equal charges in the reactant and product side
Answer:
Dalton's atomic theory states that atoms are indivisible. This has been proven through observation to be false: atoms can be divided into protons, neutrons and electrons. Dalton's theory also states that all atoms of an element are identical. This is also false because we know isotopes exist, and while they are still of the same element, they have different numbers of neutrons in their atomic nucleus.
It must have 12 electrons. The negative charge must equal a positive charge since the element has not been specified to be an ion. The reason atomic masses are usually decimal numbers is because electrons actually do contribute to the mass except in a very small amount. That amount is reflected by the decimal numbers you'll see in the atomic mass of an element.
I hope this helps!
