3 years ago

What is the relationship between atomic numbers and atomic radii of elements in group 2a

Chemistry

1 answer:

ozzi3 years ago

7 0

Im sorry i dont know that one

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How many moles of magnesium ions are present in 283.8 mL of<br> 6.74 M Mg3(PO4)2?

Dmitriy789 [7]

Answer:1 mole of Mg3(PO4)2 (molecule) contains 3 moles of Mg atoms, 2 moles of P atoms and 2X4 moles of O atoms. = 0.03125 moles.

Explanation:

6 0

3 years ago

PH que tendra una solución cuya concentracion de [OH-] = 1x10-4

natta225 [31]

I don’t understand wha u just said but thanks for the points

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Which of the following elements are more reactive than the others.

Rama09 [41]

The answer is D-sodium!

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Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value. (1.8 x 1

slamgirl [31]

Answer : The answer is, $0.2\times 10^{-4}$

Explanation :

Scientific notation : It is defined as the way or representation of expressing the number that are too big or too small that is written in the decimal form. That means always written in the power of 10 form.

For example : 8000 is written as, $8.0\times 10^3$ in this notation, the significant figure is, 1 but $0.8\times 10^4$ in this notation, the significant figures are, 2

The given problem are :

$\frac{1.8\times 10^{-2}}{9\times 10^2}=0.2\times 10^{-4}$

According to the divide and multiplication rules of scientific figures, the final answer is only as precise as the value with the least number of significant figures.

Hence, the answer is, $0.2\times 10^{-4}$

6 0

3 years ago

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The middle block of the periodic table is called?

Masteriza [31]

Answer: The transition metals make up the middle block of he periodic table

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3 years ago