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3 years ago

Two elements that have the same ground-state valence shell configuration of ns 2 np 2 are

Chemistry

1 answer:

kvv77 [185]3 years ago

6 0

Answer:

carbon and silicon

Explanation:

Various groups of elements in the periodic table have different outermost shell electron configurations. Actually, elements are classified into groups on the basis of the number of electrons on the outermost shell of those elements. All elements with the same number of electrons on their outermost shell belong to the same group in the periodic table.

For elements in group 14, they all have four electrons on their outermost shell. Their general outer electron configuration is ns2 np2 as shown in the question. Two prominent members of this group are carbon and silicon. This ns2 np2 is the ground state outer electron configuration of all group 14 elements in the periodic table.

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Convert 5.8 km to the unit mm. <br> 0.0000058 mm <br> 0.0058 mm <br> 5,800 mm <br> 5,800,000 mm

spin [16.1K]

Its going to b 5,800,000 due to each Km being 1,000,000 Mm
Hope this helps :D

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3 years ago

What are 3 effects of nuclear radiation

aivan3 [116]

In a nuclear explosion the human body can be irradiated by at least three processes. The first, and most major, cause of burns is due to thermal radiation and not caused by ionizing radiation. Thermal burns from infrared heat radiation, these would be the most common burn type experienced by personnel.

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3 years ago

Which one of the following statements best describes a solution with a pH of 3?

zalisa [80]

Statement D is the correct option as the solution will have pH of 3. It has an H3O+ ion concentration of 1 × $10^{-3}$ mol/L and is acidic.

Explanation:

It is given in question that solution must have pH of 3. The value if being less than 7 shows that solution is acidic. The pH value of 3 indicates that given solution is highly acidic and has strong acid. Strong acid gets fully dissociated into $H_{3}$ $O^{+}$ ions.

pH of the solution is calculated as:

pH = -log10[ $H_{3}$ $O^{+}$ ]

the concentration or molarity of the hydronium ion is given as moles/litre

concentration of hydronium ion in the solution is 1 X $10^{-3}$ moles/litre

putting the values in the equation:

pH = - log10( 1 X $10^{-3}$ )

pH = 3 (acidic)

Thus it can be concluded that D option is the right answer.

6 0

4 years ago

Which of these following have a positive charges

Over [174]

Talking about ions, a cation has a positive charge. That means a positive charge is gained by an atom that gives out electrons.

7 0

3 years ago

For the following reaction, 5.22 grams of aluminum oxide are mixed with excess sulfuric acid. The reaction yields 12.9 grams of

Mamont248 [21]

Answer:

$m_{Al_2(SO_4)_3}=17.5gAl_2(SO_4)_3$

Explanation:

Hello,

In this case, the undergoing balanced chemical reaction is:

$Al_2O_3(s)+3H_2SO_4(aq)\rightarrow Al_2(SO_4)_3(aq)+3H_2O(l)$

Thus, as 5.22 grams of aluminium oxide reacts, the required yielded amount of aluminium sulfate results:

$m_{Al_2(SO_4)_3}=5.22gAl_2O_3*\frac{1molAl_2O_3}{102gAl_2O_3}*\frac{1molAl_2(SO_4)_3}{1molAl_2O_3}*\frac{342gAl_2(SO_4)_3}{1molAl_2(SO_4)_3} \\\\m_{Al_2(SO_4)_3}=17.5gAl_2(SO_4)_3$

Moreover, the percent yield is:

$Y=\frac{12.9g}{17.5g} *100\%=73.7\%$

Best regards.

6 0

4 years ago