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max2010maxim [7]
3 years ago
8

The element hydrogen has one valence electron. which of the following elements also has only one valence electron?

Chemistry
1 answer:
Natali5045456 [20]3 years ago
8 0
The answer is a. rubidium, because is located in the first group as well.
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18) Calculate the molarity
Sloan [31]

Answer:

B. 0.92 M

Explanation:

Molarity of a solution = number of moles (n) ÷ volume (V)

According to the information provided in this question;

mass of NaCl = 42g

Volume of water = 780mL

Using mole = mass/molar mass

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

mole = 42/58.5

mole (n) = 0.72mol

Volume (V) = 780 mL = 780/1000 = 0.780 L

Hence, molarity = n/V

Molarity = 0.72/0.780

Molarity = 0.923 M

4 0
2 years ago
An isotope has 15 protons, 16 neutrons, and 15 electrons. What is the isotopic notation of the isotope
VikaD [51]

Answer:

^{31}_{15}P is the isotopic notation of the atom

Explanation:

The isotope notation is:

^a_bX

<em>Where a is the mass number = Number of protons + Number of neutrons</em>

<em>b is atomic number = Number of protons</em>

The atomic number define the nature of the atom, the element with atomic number = 15 is phosphorus, P:

^a_bP

a = 15 protons + 16 neutrons = 31

b = 15

^{31}_{15}P is the isotopic notation of the atom.

3 0
3 years ago
What volume would 3.01•1023 molecules of oxygen gas occupy at STP?
Sliva [168]
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6 0
3 years ago
The boiling point of a solution with a non-volatile solute is higher than that of the pure solvent . True or false
RUDIKE [14]
True because
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6 0
2 years ago
Which molecule in plants cells first captures the radiant energy from sunlight?
melisa1 [442]

Answer:

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Explanation:

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7 0
2 years ago
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