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3 years ago

13

Element R and Element Q have the same number of valence electrons. These elements have similar chemical behavior, but element R

has fewer energy levels than element Q
Describe what their positions on the Periodic Table have in common.

1 answer:

I am Lyosha [343]3 years ago

7 0

Answer:

I dont now because I am in 6 class

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hope this helps :)

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3 years ago

What is the empirical formula of the compound that is 25.3% magnesium and 74.7% chlorine

Margarita [4]

Answer: $MgCl_2$

Explanation:

25.3% Mg

74.7% Cl

First step: change % to g

25.3g Mg

74.7g Cl

Second step: calculate g/mol of each compound. You can do this by using the atomic mass.

$25.3gMg(\frac{1mol}{24.30g})=1.04mol$

$74.7gCl(\frac{1mol}{35.45g} )=2.11mol$

Third step: determine the lowest number and divide everything by it. Of the result, extract whole number only.

$Mg=\frac{1.04}{1.04} =1$

$Cl=\frac{2.11}{1.04}=2$

Fourth step: Write each compound with their respective number below.

This empirical formula should be: $MgCl_2$

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3 years ago