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rewona [7]
3 years ago
6

The electronic arrangement of an atom shows how electrons are distributed across the different energy levels. Which of the follo

wing elements is represented by the electron arrangement 2, 8, 18, 6?
А Сa
B. Mg
C. S
D Se
E. Ga
Chemistry
1 answer:
bazaltina [42]3 years ago
5 0

Answer:

The answer is D which is Selenium

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A pan containing 20 grams of water was allowed to cool from temperature of 95 degrees C. If the amount of heat released is 1200
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Answer:

81 °C

Explanation:

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Which element from this portion of the table chemically reacts in a way similar to the way the element chlorine (Cl) reacts? (1)
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The Earth's diameter at the equators is _____ its diameter at the poles. A:greater than B:equal to C:less than
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2 years ago
What is the molarity of a nitric acid solution if 43.13 mL 0.1000 M KOH solution is needed to neutralize 30.00 mL of the acid so
Leno4ka [110]

Answer:

0.144M

Explanation:

First, let us write a balanced equation for the reaction. This is illustrated below:

HNO3 + KOH —> KNO3 + H20

From the equation,

nA = 1

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From the question given, we obtained the following:

Ma =?

Va = 30.00mL

Mb = 0.1000M

Vb = 43.13 mL

MaVa / MbVb = nA/nB

Ma x 30 / 0.1 x 43.13 = 1

Cross multiply to express in linear form

Ma x 30 = 0.1 x 43.13

Divide both side by 30

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The molarity of the nitric acid is 0.144M

8 0
3 years ago
What is the gram formula of na2co3
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Answer:

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element. number masses

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then add

106 gfm

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