In order to balance this, you have to count each
element where the elements in the reactants side and the product side should
have equal number of molecules. The balanced reaction is as follows:
2HCl + Ca(OH)2 = CaCl2 + 2H2O
B. A mole is the molar mass in 1 liter. So 2 m needs 2 moles in 1 liter.
A neutral atom will have the same number of electrons as protons. Since you did not mention that it was ion, I will assume that it is a neutral atom.
In a neutral atom, the number of electrons is the same as the number of protons. An an ion, the number of electrons may be less than or even greater than the number of protons depending on the charge.
An atom is defined by the number of protons it has. If you change the number of protons, it becomes a different atom. However, if you change the number of electrons it has, it is the same atom but it is called an ion because it will have a different charge. If you change the number of neutrons, you do not change the atom, but you change the overall mass of the atom. Keep in mind that a neutron is as heavy as a proton, and that the mass of an electron is almost negligible when compared to the mass of a proton and neutron.
As this is a neutral atom, the number of electrons should be the same as the number of protons. There are 3 electrons in this atom. This would be the atom lithium.
Answer:
<u>The effective nucleus charge increases on going from left to right.</u>
<u></u>
Explanation:
There are two factors that determine the atomic size of the atom.
1. Shielding constant :It is the shielding of the outershell electron from the nucleus by the inner shell electron. Thses are repulsive forces.If the value of shielding contant is more , then the size of the element increases.
2.The Effective Nuclear Charge : The net attraction of the nucleus felt by the electron present in the outermost shell . It is represented by Zeff.
This is attractive force.
If the Zeff is more then the nucleus of the element will pull the electron cloud more strongly.This leads to decrease in the size of the element.
On going left to right ,each time one electron is added to the element .This electron attracts the nucleus more strongly<u><em>(the nucleus is Positive charge and the electron is negative charge, opposite charge attracts each other</em></u>). Hence , the size decreases.
Thus, in period two , there is decrease in the atomic radius with increasing atomic number because the effective nuclear charge increases on going from left to right.
Answer:
has higher boiling point
Explanation:
has higher boiling point because in
,
has a very strong dipole and we know that whenever there is dipole-dipole interaction then boiling point increases. On the other hand in
the NO group has not so strong dipole which weakens its boiling point
So the boiling point of
is higher than the boiling point of