2 years ago

Why is mining for coal a long-term concern?

Chemistry

2 answers:

Delvig [45]2 years ago

8 0

Answer:

Explanation:

Coal is a non-renewable resource, so the supply can't produce faster than we can mine it.

Step2247 [10]2 years ago

8 0

Answer: Is B: the supply will eventually be exhausted.

Explanation:

there is only so much coal in the world as in many other elements. That is why we are looking for more appropriate and resourceful way of supplying energy and it is a lot safer for the workers involved

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The sum of the atomic mass values of the atoms in a chemical formula is known as ____________.

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Answer:

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Write word equations for the reactions of a) magnesium with chlorine b) potassium with oxygen c) sodium with bromine d) carbon w

IRINA_888 [86]

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3 years ago

Which of these atoms has the largest number of neutrons in the nucleus?

viktelen [127]

Holonium and Gadolinium has the highest number of neutrons in the nucleus.

Looking at the atoms listed;

Dysprosium has 66 protons

Holonium has 67 protons

Neodymium has 60 protons

Europium has 63 protons

Gadolinium has 64 protons

Then,

Number of neutrons = Mass number - number of protons

For Dysprosium

157 - 66 = 91 neutrons

For Holonium

162 - 67 = 95 neutrons

For Neodymium

149 - 60 = 89 neutrons

For Europium

148 - 63 = 85 neutrons

For Gadolinium

159 - 64 = 95 neutrons

Hence, Holonium and Gadolinium has the highest number of neutrons in the nucleus.

Learn more: brainly.com/question/14156701

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