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3 years ago

The elements helium and xenon are all part of the same

Chemistry

1 answer:

aliya0001 [1]3 years ago

3 0

They are both in the same family/group.

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JUST ONE MULTIPLE CHOICE QUESTION!

Butoxors [25]

I think it’s The second option sorry if I’m wrong

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3 years ago

One isotope of oxygen differs from another isotope of oxygen in *

Reptile [31]

Each isotope of Oxygen has a different number of neutrons

<h3>Further explanation </h3>

The elements in nature have several types of isotopes

Atomic mass is the average atomic mass of all its isotopes

Isotopes are atoms has the same number of protons but has a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

Some of the isotopes of oxygen are:

$\tt _8^{16}O,_8^{17}O,_8^{18}O$

Each isotope has 8 protons and 8 electrons but has a different number of neutrons

For O-16: number of neutrons = 16-8 = 8

For O-17: number of neutrons = 17-8 = 9

For O-18: number of neutrons = 18-8 = 10

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2 years ago

Lunar Eclipe's do not happen every month because the moon, earth and sun must be lined up in a certain way.

Andreyy89

Answer:

A. True

Explanation:

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4 0

2 years ago

Read 2 more answers

Describe the difference between a reaction that occurs spontaneously and one that does not

lidiya [134]

2.B. Describe the difference between a reaction that occurs spontaneously and one that does not. Spontaneous chemical reactions release energy and use that energy to power itself; non-spontaneous chemical reactions need to absorb energy, which they can't absorb their own energy that they don't even have.

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2 years ago

How many milliliters of sodium metal, with a density of 0.97 g/mL, would be needed to produce 53.2 grams of hydrogen gas in the

olchik [2.2K]

The balanced chemical reaction is:

<span>2Na + 2H2O → 2NaOH + H2
</span><span>
We first use the amount of hydrogen gas to be produced and the molar mass of the hydrogen gas to determine the amount in moles to be produced. Then, we use the relation from the reaction to relate H2 to Na.

53.2 g H2 ( 1 mol / 2.02 g ) ( 2 mol Na / 1 mol H2 ) ( 22.99 g / 1 mol ) = 1210.96 g Na

1210.96 g Na ( 1 mL / 0.97 g ) = 1248.41 mL Na needed</span>

7 0

2 years ago

The elements helium and xenon are all part of the same ​

The elements helium and xenon are all part of the same