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Neko [114]
3 years ago
9

Match the element with its number of valence electrons. Match Term Definition: Helium Aluminum Fluorine Sodium A) 1 B) 2 C) 3 D)

7
Chemistry
2 answers:
wariber [46]3 years ago
5 0

Helium- 2

Aluminum- 3

Fluorine- 7

Sodium- 1

Hope I helped.

vampirchik [111]3 years ago
3 0

<u>Explanation:</u>

Valence electrons are defined as the electrons that are present in the outermost shell of an atom.

  • Helium is the 2nd element of the periodic table having electronic configuration of 1s^2

This element has 2 electrons in its outermost shell. So, it has 2 valence electrons. The correct answer is Option B.

  • Aluminium is the 13th element of the periodic table having electronic configuration of 1s^22s^22p^63s^23p^1

This element has 3 electrons in its outermost shell. So, it has 3 valence electrons. The correct answer is Option C.

  • Fluorine is the 9th element of the periodic table having electronic configuration of 1s^22s^22p^5

This element has 7 electrons in its outermost shell. So, it has 7 valence electrons. The correct answer is Option D.

  • Sodium is the 11th element of the periodic table having electronic configuration of 1s^22s^22p^63s^1

This element has 1 electron in its outermost shell. So, it has 1 valence electron. The correct answer is Option A.

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When molality = no.of moles of solute/weight Kg of solvent

and when we have the no. of moles of solute = 8.1 moles
and the weight Kg of the solvent =4847 g /1000 = 4.847 Kg
so by substitution :
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4 0
4 years ago
Read 2 more answers
) A children’s liquid cold medicine has a density of 1.23 g/mL. If a child is to take 2.5 tsp in a dose, what is the mass in gra
vekshin1

The relation between density and mass and volume is

Density=\frac{Mass}{volume}

the dose required is 2.5 tsp

each tsp contain 5mL

So dose required in mL = 2.5 X 5 = 12.5 mL

the mass will be calculated using following formula

Mass=DensityXvolume

Mass=1.23\frac{g}{mL}X12.5mL= 15.38g

The mass of dose in grams will be 15.38 g


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