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3 years ago

16. Which of the following properties of the elements remain unchanged across

Chemistry

1 answer:

Inessa [10]3 years ago

5 0

Answer:

Number of shells

Explanation:

Across the period on the periodic table, the number of shells remains the same. There is no variation or trend for the number of shells on a period.

The number of shell is the energy level corresponding to an atom.
As we go from period to period, the energy level increases by 1.
The period number corresponds to the number of shells.
Elements in period 4 will have 4 shells.
There is no variation of any sort in the number of shell across a period.

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Below are shown, for five metals, reduction reactions and standard electrode potential values. which of these metals is the leas

just olya [345]

Above question is incomplete. Complete question is attached below
........................................................................................................................
Solution:
Reduction potential of metal ions are provided below. Higher the value to reduction potential, greater is the tendency of metal to remain in reduced state.

In present case, reduction potential of Au is maximum, hence it is least prone to undergo oxidation. Hence, it is least reactive.

On other hand, reduction potential of Na is minimum, hence it is most prone to undergo oxidation. Hence, it is most reactive.

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4 years ago

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charle [14.2K]

Answer:

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Explanation:

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3 years ago

Read 2 more answers

Fluoride ion is poisonous in relatively low amounts: 0.2 g of F- per 70 kg of body weight can cause death. Nevertheless, in orde

svetoff [14.1K]

Answer:

$\boxed{\text{(a) 14 L; (b) 711 kg}}$

Explanation:

(a) Litres of water

$\text{Mass of F}^{-} = 8.5 \times 10^{7}\text{ gal} \times \dfrac{\text{0.2 mg F}^{-}}{\text{1 kg}} = \textbf{14 mg F}^{-}\\\\\text{Volume of water} = \text{14 mg F}^{-} \times \dfrac{\text{1 L water}}{\text{1 mg F}^{-}} = \textbf{14 L water}\\\\\text{The person would have to consume $\boxed{\textbf{14 L}}$ of water per day}$

(b) Mass of NaF

$\text{Volume} =8.5 \times 10^{7} \text{gal} \times \dfrac{\text{3.785 L}}{\text{1 gal}} = 3.22 \times 10^{8}\text{ L}\\\\\text{Milligrams of F}^{-} = 3.22 \times 10^{8}\text{ L} \times \dfrac{\text{ 1 mg F}^{-}}{\text{1 L}} = 3.22 \times 10^{8}\text{ mg F}^{-}\\\\\text{kilograms of F}^{-} = 3.22 \times 10^{8}\text{ mg F}^{-} \times \dfrac{\text{1 mg F}^{-}}{10^{6}\text{kg F⁻}} = \text{322 kg F}^{-}$

1 kmol of NaF (41.99 kg) contains 19.00 kg of F⁻.

$\text{Kilograms of NaF}= \text{322 kg F}^{-} \times \dfrac{\text{41.99 kg NaF}}{\text{19.00 kg F}^{-}} = \text{711 kg NaF}\\\\\text{It will take } \boxed{\textbf{711 kg}} \text{ of NaF to treat the reservoir}$

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3 years ago

Read 2 more answers

What units do chemists normally use for the density of liquids and solids? For the density of gas? Explain the differences.

beks73 [17]

Answer:

Densities of the solids and the liquids are expressed in units of grams per cubic centimeter (g/cm³) or in grams per milliliter (g/mL).

Densities of the gases are usually expressed in the units of grams per liter (g/L).

Explanation:

Density of a substance can be defined as the ratio of its mass and its volume.

The constituting atoms in the solids and liquids are fairly packed closely together.

In general, a 1 cm³ or 1 mL volume of most of the solids and the liquids has mass of several grams. Thus, densities of the solids and the liquids are expressed in units of grams per cubic centimeter (g/cm³) or in grams per milliliter (g/mL).

The constituent atoms or the molecules in the gases are far apart from each other when compared to the solids and the liquids.

Thus, gases are much less dense and even about 1 L of gas have mass in range close to 1 gram. Thus, densities of the gases are usually expressed in the units of grams per liter (g/L).

Also, the density of the gases also depend upon the pressure and the temperature but these factors much not influence the density of the solids and the gases.

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4 years ago

For an electron that interacts with visible light, which visible photon would give the most accurate (lowest error) measurement

Rom4ik [11]

Answer:

violet

Explanation:

When an electron interacts with visible light, energy is transferred from the photon to the electron.

The most accurate (lowest error) measurement of momentum (or speed) of an electron is obtained using a photon of high energy and low wavelength.

Violet light which lies at the high energy end of spectrum is most suitable.

4 0

3 years ago