Answer:
Because the density of water is one
Answer : The incorrect option is, The most of the mass of the atom comes from the electron cloud.
Explanation :
There are three basic particles of an atom which are neutrons, protons and electrons.
The nucleus which is present in the center of an atom that contains the neutrons and the protons. The protons are positively charged and neutrons has no charge.
The outer region of an atom contains the electrons and the electrons are negatively charged.
As per given options, the statement which is the most of the mass of the atom comes from the electron cloud is incorrect statement because the most of the mass comes from the nucleus in which protons and neutrons are present.
Iron oxide is rust. So oil would be an inhibitor.
The answer is A. In case you wanted to know, the actual answer is 4.184. If anything is unclear, just ask!
This is an incomplete question, here is a complete question.
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 
?
Find the force acting on the electron as it revolves in a circular orbit of radius 
.
Answer : The force acting on electron is, 
Explanation :
Formula used :
where,
F = force acting on electrons
m = mass of electrons = 
v = speed of electron =
r = radius of circular orbit =
Now put all the given values in the above formula, we get:
Thus, the force acting on electron is,
