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3 years ago

Connect the group to the configuration.pleas help !!

Chemistry

2 answers:

butalik [34]3 years ago

8 0

Answer:

2, 8 7 7 valence electrons Group 7

2, 8 , 1 1 valence electrons Group 1

2 8 3 3 valence electrons Group 3

2 4 4 valence electrons Group 4

2 8 8 2 2 valence electrons Group 2

Explanation:

The valency of an electronic configuration of an atom can be used to determine the group an element belongs.

The valency is the number of outermost shell electrons an atom contains.

So;

2, 8 7 7 valence electrons Group 7

2, 8 , 1 1 valence electrons Group 1

2 8 3 3 valence electrons Group 3

2 4 4 valence electrons Group 4

2 8 8 2 2 valence electrons Group 2

LenaWriter [7]3 years ago

7 0

Explanation:

The group number in the periodic table represents number of valence electrons of the elements in a certain group.

Group 1 : 2,8,1

Group 2 : 2,8,8,2

Group 3 : 2,8,3

Group 4: 2,4

Group 7 : 2,8,7

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3 years ago

Is potential or kinetic energy affected by mass?

Shkiper50 [21]

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3 years ago

Read 2 more answers

How many moles of water molecules are in 6.81 g of magnesium sulfate heptahydrate (Epsom salts

loris [4]

Answer: 0.34 mol

Justification:

1) Hepta means 7, so heptahyrate means 7 parts of water. On mole of magnesium sulfate heptadydrate has seven moles of water.

2) The formula of magnesium sulfate heptahydrate is:

Mg SO4 . 7 H2O

3) Calcualte the number of moles of the compound by dividing the mass in grams by the molar mass of formula.

molar mass:

Mg: 24.3 g/mol
S: 32.1 g/mol
O4: 4 * 16.0 g/mol = 64.0 g/mol
H2: 2 * 1.0 g/mol = 2.0 g/mol
O: 16 g/mol

Molar mass = 24.3 g/mol + 32.1 g/mol + 64.0 g/mol + 2.0 g/mol + 16.0 g/mol = 138.4 g/mol

number of moles = mass in grams / molar mass = 6.81 g / 138.4 g/mol = 0.049 mol

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3 years ago

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What element is located in group 2, period 2?

telo118 [61]

This element is beryllium.

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3 years ago

Which forces of attraction do you think are stronger, the attractions that are broken or the new attractions that are formed? Ex

jasenka [17]

Answer: The forces of attraction are stronger in new attractions that are formed.

Explanation:

When a chemical reaction takes place between two or more different compounds then less reactive substance is displaced by the more reactive substance.

During this process, when bonds are broken between the reactants then it means the force of attraction is less stronger. The formation of new compounds occur because force of attraction is more in these new substances due to which its atoms come closer to each other.

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2 years ago