Particles that orbit the nucleus are called electrons.
Explanation: Electrons are negatively charged particles arranged in orbits around the nucleus of an atom and determining all of the atom's physical and chemical properties except mass and radioactivity.
The salt desolves into the water which forms a solution which is called a mixture.
Answer: The coefficient we should change first is for
.
Explanation:
The given reaction equation is as follows.

Here, number of atoms present on reactant side are as follows.
- Al = 1
- Ni = 1
= 2
Number of atoms present on the product side are as follows.
- Al = 1
- Ni = 1
= 3
To balance this equation, multiply Al by 2 and
by 3 on reactant side. Also, multiply
by 2 and Ni by 3 on the product side.
Hence, the equation can be rewritten as follows.

Now, number of atoms present on reactant side are as follows.
- Al = 2
- Ni = 3
= 6
Number of atoms present on product side are as follows.
- Al = 2
- Ni = 3
= 6
Since, the atoms on both reactant and product side are same. Hence, it is now a balanced chemical equation.
Thus, we can conclude that the coefficient we should change first is for
.
C. 12222632
You have to follow the Aufbau principle, which states that electrons populate the atomic orbitals situated at the lowest energy first.
The orbitals are:
1
22
333
4444
5555
666
77
Answer:
Br
Explanation:
atomic size grows as we go from left to right side of the periodic table since Si has atomic number of 14 and Br 35,we can say Br has more atomic size.