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Alexus [3.1K]
3 years ago
9

Please help guys!!! Points + Brainliest

Mathematics
2 answers:
Bas_tet [7]3 years ago
8 0
Protons and electrons are 12. For neutrons, there are 12 of them. 
<span>Magnesium has an </span>atomic number<span> of 12, which means there are 12 protons.
You subtract the atomic number from the mass number in order to find neutrons.
</span>Atomic mass is 24. 24-12=12
Electrons always match the number of protons.
Ipatiy [6.2K]3 years ago
5 0

Answer:

Part 2:

There are 19 protons in the element K, you can tell because of the number 19 above the elements abbreviation. There are also 19 electrons in this element, you can tell because the number of protons is the same number of electrons. Last, to find the number of neutrons an atom possesses, you have to round the atomic mass ( 39.089 to 39 ). Then you take your Mass number ( 39 ) and subtract it from your number of protons (19). 39 - 19 = 29, there are 29 neutrons in the element K.

Hope that this helps! :)

Also if you need part 1 :)

Part 1:

The two-element that has the same properties as Magnesium are Calcium (Ca) and Strontium (Sr). These three elements are all Alkaline earth metals, they are not as reactive as Alkali metals but they are too reactive to be found in nature.

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Alja [10]

Answer: 0.4302

Step-by-step explanation:

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Standard deviation : \sigma=\text{6.7 miles }

Sample size : n=60

Also, these distances are normally distributed.

Then , the formula to calculate the z-score is given by :-

z=\dfrac{x-\mu}{\sigma}

For x=32.5

\\\\ z=\dfrac{32.5-38.7}{6.7}=-0.925373134\approx-0.93

For x=40.5

\\\\ z=\dfrac{40.5-38.7}{6.7}=0.268656\approx0.27

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3 0
3 years ago
What is the product?
Alona [7]

Answer:

\boxed{- 12 {s}^{2}  + 11st - 2 {t}^{2} }

Step-by-step explanation:

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7 0
3 years ago
Ronata is putting lace around the rectangular tablecloth with width of 52 and 1/3 inches and length of 72 and 2/3 inches. How mu
rodikova [14]

Answer:

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Step-by-step explanation:

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3 0
3 years ago
He<br> Find the volume of this cylinder. Use 3 for pi<br> V = ?
Alborosie

Answer:

30in^3

Step-by-step explanation:

3x1^2x10=

3x1x10=

30

30in^3

3 0
2 years ago
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