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Among all the given options, the correct option is option B.  If an atom has 6 protons, 6 neutrons, and 6 electrons, its isotope would have a different number of neutron.

What is isotope?

A chemical element's isotope is one of two or more types of atoms that have the same atomic number, location in the periodic table, and virtually similar chemical behavior, but differ in atomic mass and physical characteristics.

The first step in identifying and labeling an atom is to count the protons inside its nucleus. Usually, this number of protons is represented by the letter Z.

The fact that all atoms that share the same atomic number possess essentially equal chemical characteristics lends the atomic number its enormous significance. If an atom has 6 protons, 6 neutrons, and 6 electrons, its isotope would have a different number of neutron.

Therefore, the correct option is option B.

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Answer:

Explanation:

An old river occurs at the plain course and it is at its lower stage.

Here:

1. The river gradient is very gentle as it is on a plain.
2. An old river would be at its depositional phase where all the sediments its carries are being laid down.
3. It has a low velocity and a very sluggish flow.
4. Lateral erosion is very active at this stage.
5. The volume of the river increases substantially as more river tributaries joins.
6. Some of the river features are flood plains, leeves, ox-bow lakes, delta e.tc.

Answer:

MgCl₂ = 94 g

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

Chemical equation:

MgCl₂ + Li₂CO₃  → MgCO₃ + 2LiCl

 ?        +    75 g  =    135 g + 34 g

The mass of reactant and product must be equal. That's why,

135+ 34 = 169 on product side

94 + 75 = 169 on reactant side

MgCl₂ + Li₂CO₃    →    MgCO₃ + 2LiCl

  94    +    75 g     =    135 g + 34 g

      169 g             =        169 g

This is a unit conversion problem. Nm (nanometer) is smaller than mm (millimeter).

1 mm = 1/10³m = 1 x 10⁻³ m

1 nm = 1/10⁹ m = 1 x10⁻⁹ m

1 m = 1 x 10⁹ nm

Hence, 2 mm = 2 x 10⁻³ m

Then we can convert 2 x 10⁻³ m to nm by multiplying with 10⁹.

Then 2 mm = 2 x 10⁻³ m = 2 x 10⁻³ x 10⁹ nm = 2 x 10⁶ nm.

Hence, the thickness of nickel is 2 x 10⁶ nm.