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Alex73 [517]
3 years ago
11

An atom of a certain element has 19 protons, 19 electrons, and a mass number of 39. This element is very reactive. How many neut

rons are in this atom?
Chemistry
1 answer:
gogolik [260]3 years ago
6 0

Answer:

There would be 20 neutrons in that atom.

Explanation:

The mass number of an atom is the sum of:

  • the number of neutrons in this atom, and
  • the number of protons in this atom.

Electrons do not contribute to the mass number of an atom.

From the question:

  • Mass number of this atom: 39.
  • Number of protons in this atom: 19.

(\text{Mass Number}) = (\text{Number of protons}) + (\text{Number of neutrons}).

In this atom:

39 = 19 + (\text{Number of neutrons}).

Hence, the number of neutrons would be 39 - 19 = 20.

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Which of the following weak interactions would require the least amount of energy to disrupt? Group of answer choices
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Explanation:

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How much energy is required to raise the temperature of 10.6 grams of gaseous neon from
Alona [7]

Answer:

Approximately 1.95 \times 10^{2}\; \rm J.

Explanation:

Look up the specific heat of gaseous neon:

c = 1.03 \; \rm J \cdot g^{-1} \cdot K^{-1}.

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\Delta T = (37.9 - 20.0)\; \rm K = 17.9\; \rm K.

Let m denote the mass of a sample of specific heat C. Energy required to raise the temperature of this sample by \Delta T:

Q = c \cdot m \cdot \Delta T.

For the neon gas in this question:

  • c = 1.03\; \rm J \cdot g^{-1}\cdot K^{-1}.
  • m = 10.6\; \rm g.
  • \Delta T = (37.9 - 20.0)\; \rm K = 17.9\; \rm K.

Calculate the energy associated with this temperature change:

\begin{aligned}Q &= c \cdot m \cdot \Delta T \\ &= 1.03\; \rm J \cdot g^{-1}\cdot K^{-1} \times 10.6\; \rm g \times 17.9\; \rm K \\ &\approx 1.95 \times 10^{2}\; \rm J\end{aligned}.

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