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kirill115 [55]
3 years ago
10

Use the periodic table to determine the number of valence electrons in each of the following elements.

Chemistry
2 answers:
pogonyaev3 years ago
5 0
Answer:
Na= 1, Ar= 8, V= 5, F= 7


Explanation:
You can determine the number of valence electrons in an element by looking the the group/column # on the periodic table. Elements in the same family/ group are organized by columns (vertical). Elements in the same column have the same number of valence electrons (electrons of the outermost shell) and consequently similar properties.
Simply put, GROUP #= # VALENCE E-

There are exceptions to this, especially when determining the amount of valence electrons in elements that are in a compound or in transition metal elements. For transition metals (that have different oxidation states- different # of valence electrons for the same element) I’d just look it up
Nina [5.8K]3 years ago
3 0

Answer:

Na:  1

F:    7

V:    5

Ar:   8

C:    4

Explanation:

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Which of the following units would be the most appropriate for measuring the mass of a grain of rice? A. milligrams B. grams C.
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Rx: Codeine phosphate 30 mg/tsp Tussin syrup 30mL Elixophyllin qs 240 mL Sig: 5mL qid pc hs If 5 mL of Tussin syrup contains 100
kotykmax [81]

Answer:

50 mg.

Explanation:

From the prescription, 240 ml amount is to be prepared containing 30 ml tussin syrup. As the frequency is 5 mL qid, it means 5mL of syrup is to be administered four times daily i.e. 20 mL daily. To calculate the amount of tussin taken daily,

<em>                          </em><em><u>30 mL tussin</u></em><em> = </em><em><u>X mL of tussin</u></em>

<em>                     240 mL solution    20ml solution</em>

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4 years ago
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How much energy must be added to a 2-kg piece of wood with a specific heat
lesya692 [45]

Answer:

A. 140,800 J

Explanation:

Specific heat of a material is defined as the amount of energy required to increase in 1°C 1kg of the material. <em>For wood there are required 1760J perkg per °C.</em>

The equation is:

Q = C*m*ΔT

<em>Where Q is heat in Joules,</em>

<em>C is specific heat (1760J/kg°C),</em>

<em>m is mass (2kg)</em>

<em>ΔT is change in temperature (50°C - 10°C = 40°C)</em>

Replacing:

Q = 1760J/kg°C*2kg*40°C

Q = 140800J

Right option is:

<h3>A. 140,800 J </h3>

<em />

6 0
3 years ago
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