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3 years ago

In which shell are the valence electrons of the elements in Period 2 found?

Chemistry

2 answers:

defon3 years ago

8 0

B 2
is which shell are the valence electrons of the elements in period 2 found

Diano4ka-milaya [45]3 years ago

4 0

Answer:

(2) 2

Explanation:

The period of an element indicates in which shell are the valence electrons. So, all the elements of the Period 2 have their valence electrons in the 2nd shell.

A period in the periodic table is a row of chemical elements.

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Consider the equation: 2NO(0) - N.04(). Using ONLY the information given by the equation which of the following

ratelena [41]

Answer:

By increasing the pressure, the molar concentration of N2O4 will increase

Explanation:

We have the equation 2NO2 ⇔ N2O4

This equation is reversible and exotherm. By decreasing the temperature, the reaction will produce more energy, so the reaction will move to the right. But a lower temperature also lowers the rate of the process, so, the temperature is set at a compromise value that allows N2O4 to be made at a reasonable rate with an equilibrium concentration that is not too unfavorable

So increasing the temperature will shift the equilibrium to the left. The equilibrium shifts in the direction that consumes energy.

If we decrease the concentration of NO2, the equilibrium will shift to the left, resulting in forming more reactants.

To increase the molar concentration of the product N2O4, we have to increase the pressure of the system.

NO2 takes up more space than N2O4, so increasing the pressure would allow the reactant to collide more form more product.

By increasing the pressure, the molar concentration of N2O4 will increase

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3 years ago

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From top to bottom in most groups of elements, atomic radii tend to A. decrease because the nuclear charge increases. B. decreas

Stels [109]

D. As more electrons are added to an element, the number of electron orbitals being filled increases

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3 years ago

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The atomic mass of carbon -13 is 13. It has six protons. How many neutrons does the isotope have

marishachu [46]

Answer:

13 - 6 =7

Explanation:

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3 years ago

Who are the scientists that contributed in arranging of the periodic table?

Irina-Kira [14]

In 1869 Russian chemist DIMITRI MENDELEEV started the development of the periodic table,arranging chemical elements by atomic mass. He predicted the discovery of other elements and left spaces open in his periodic table for them. HOPE THIS HELPSS HAVE A GREAT DAY <333

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3 years ago

If you added 45,000 calories to water that was at 25 degrees C, and the ending temperature was 35 degrees C, how much water did

user100 [1]

Answer:

4.5 L water we have in litres (L).

Explanation:

$Q=m\times c \times \Delta T$

where

$\Delta T$ = Final T - Initial T

Q is the heat energy in calories

c is the specific heat capacity (for water 1.0 cal/(g℃))

m is the mass of water

Plugging in the values

$\\$45000 \mathrm{cal}=m \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times\left(35^{\circ} \mathrm{C}-25^{\circ} \mathrm{C}\right)$\\\\$45000 \mathrm{cal}=m \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times 10^{\circ} \mathrm{C}$\\\\$m=\frac{45000 \mathrm{cal}}{1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times 10^{\circ} \mathrm{C}}$\\\\$m=4500 \mathrm{g}$\\\\Density of water $=\frac{\text { mass }}{\text { volume }}$$

So,

Volume of water = mass/density

$\\\\=\frac{4500 \mathrm{g}}{\frac{1.09}{\mathrm{mL}}}=4500 \mathrm{mL}$$$

=4.5 L (Answer)

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3 years ago