CHEMISTRY MIDDLE SCHOOL

The elements in Group 2 have similar chemical properties because each atom of these elements has the same(a) atomic number
(b) mass number
(c) number of electron shells
(d) number of valence electrons

Answers

Answer 1
Answer:

Answer;

- (d) number of valence electrons

The elements in Group 2 have similar chemical properties because each atom of these elements has the same number of valence electrons.

Explanation;

-Group 2 elements are also called alkaline earth metals, such as calcium, magnesium, strontium, barium , etc.

-These metals have a valency of two, which means they have two electrons in the outermost energy shell. Therefore; they react by loosing two electrons to form a stable configuration or an octet configuration. They are highly metallic and are good conductors of electricity.
Answer 2
Answer: The elements in Group 2 have similar chemical properties 'cause they have the same no. of electrons.

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MgCl2 +?g
Ll2CO3 →
75g
MgCO3 +
135g
LiCl
34g


solve this

Answers

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

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Answers

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