Neutrons.
Electrons have little to no mass, therefore shouldn't be electrons.
Also there is only eight protons in this atom, while there are nine neutrons.
Hello!
Yes, a cubic meter is different from a cubic centimeter.
A centimeter consists of 10 millimeters, and a meter consists of 100 centimeters (1,000 millimeters). A cubic meter is fairly larger than a cubic centimeter.
I hope this helps you! Have a great day!
Answer:
particles in 2 moles.
Explanation:
The number of particles that are contained in one mole, the international unit of amount of substance: by definition, exactly 6.022×10²³, and it is dimensionless. It is named after the scientist Amedeo Avogadro.
It is also known as Avogadro's constant.
∴ Number of particles in one mole =
∴ Number of particles in 2 mole = 2 times Number of particles in one mole
∴ Number of particles in 2 mole=
Hence there are particles in 2 moles.
<h3>Answer:</h3>
False: Isotopes have variable number of Neutrons.
<h3>Explanation:</h3>
Isotopes are defined as those atoms of same element which have same number of protons but different number of neutrons hence, isotopes have different number of neutrons and mass number respectively.
Example:
Hydrogen have three Isotopes;
i) Protium-1 having 0 neutrons
ii) Deuterium-2 having 1 neutron
iii) Tritium-3 having 2 neutrons
While, when the number of electrons for a particular atom varies it results in the formation of ions of that atom.
Example:
Hydrogen when looses one electron it converts into H⁺
Nitrogen when gains three electrons it converts into N⁻³
Chlorine when gains one electrons it converts into Cl⁻
Magnesium when looses two electrons it converts into Mg⁺⁺
When we can get the Kinetic energy from this formula KE= 1/2 M V^2
and we can get the potential energy from this formula PE = M g H
we can set that the kinetic energy at the bottom of the fall equals the potential energy at the top so,
KE = PE
1/2 MV^2 = M g H
1/2 V^2 = g H
when V is the velocity, g is an acceleration of gravitational force and H is the height of the fall.
∴ v^2 = 2 * 9.8 * 8 = 156.8
∴ v= √156.8 = 12.5 m/s