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Shkiper50 [21]
3 years ago
10

If element x has 72 protons, how many electrons does it have? electrons

Chemistry
1 answer:
saw5 [17]3 years ago
6 0
Elements have neutral charges such as Na so if X has 72 protons + charges then it must also have 72 electrons with - charges

hope that helps
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Given that equation Na+(s)O2–> Na2O. Find the mass of sodium needed to produce 12.5 grams of sodium oxide.
Norma-Jean [14]

Answer: 9.27 g of Na

Explanation:Please see attachment for explanation

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3 years ago
If the half-life of a sample of a radioactive substance is 30 seconds, how much would be left after 60 seconds? A. one-fourth B.
Basile [38]
m=m_{0}*(\frac{1}{2})^{\frac{60}{30}}\\\\
m=m_{0}*(\frac{1}{2})^{2}\\\\
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If the half-life of a sample of a radioactive substance is 30 seconds, how much would be left after 60 seconds? <span>A. one-fourth</span>
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2 years ago
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Rashid [163]

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What is the change of energy where the wavelength is 4078 A
Leni [432]

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<h3>Further explanation</h3>

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\large{\boxed{\bold{E\:=\:h\:.\:f}}}

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

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2 years ago
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saveliy_v [14]
There are 6 hydrogen atoms in every molecule of ethanol
6 0
3 years ago
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