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Elanso [62]
2 years ago
13

I have seven energy levels, but only 1 valence eletron?

Chemistry
1 answer:
Olenka [21]2 years ago
3 0

Answer:

Francium (Fr)

Explanation:

Looking at the periodic table, Francium has 7 energy levels as it is in the 7th Period and is in the 1st Group (meaning it has one electron in the outermost shell) which suggests that it has one valence electron.

<em>Hope this helps and be sure to have a wonderful time ahead at Brainly! :D</em>

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Liono4ka [1.6K]

Answer:

d and e - Sodium and antimony

Explanation:

The atomic numbers remain the same, while the mass numbers change (because neutrons are being added or taken away).

sodium has an atomic number of 19 and a mass number of 39 - in d, it has an atomic number of 19 but a mass number of 40. therefore, it is an isotope

antimony has an atomic number of 51 and a mass number of 121.60 - in e, it has an atomic number of 51, but a mass number of 123. therefore, it is an isotope

6 0
3 years ago
How does an object look when it is viewed through an opaque object ​
Alexxx [7]
You can not see between opaque materials because light cannot pass through them.
7 0
3 years ago
If you were to conduct an experiment to answer the question, "Does the volume of a caffeinated drink affect your reaction time?”
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Answer:

A Type of Drink

Explanation:

A controlled variable remains constant throughout the experiment.

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4 0
2 years ago
Given that equation Na+(s)O2–&gt; Na2O. Find the mass of sodium needed to produce 12.5 grams of sodium oxide.
Norma-Jean [14]

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Explanation:Please see attachment for explanation

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