What trend does the atomic radius follow along a period on the periodic

Chemistry

1 answer:

Semmy [17]3 years ago

3 0

Answer:

The atomic radius gets smaller the farther right it appears on the

periodic table.

Explanation:

Number of protons is increasing across the period so electrostatic attraction between the positive nucleus and the valence electrons increases and electrons are drawn close to the positive nucleus. This increases nuclear charge and so atomic radii gets smaller.

Also, the atomic radii size also depend on Electron - electron repulsion and shielding of the outermost valence electrons by the inner-most energy levels for the positive nucleus and number of energy levels.

Across the period, the electron-electron repulsion does not increase but there is increasing nuclear charge. The valence electrons are added to same energy level so electron shielding of the positive nucleus by the inner electrons is the same across the period.

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Salt in crude oil must be removed before the oil undergoes processing in a refinery. The

irina1246 [14]

Answer:

$\large \boxed{0.64 \, \%}$

Explanation:

Assume you are using 1 L of water.

Then you are washing 4 L of salty oil.

1. Calculate the mass of the salty oil

Assume the oil has a density of 0.86 g/mL.

$\text{Mass of oil} = \text{4000 mL} \times \dfrac{\text{0.86 g}}{\text{1 mL}} = \text{3440 g}$

2. Calculate the mass of salt in the salty oil

$\text{Mass of salt} = \text{3440 g} \times \dfrac{\text{5 g salt}}{\text{100 g oil}} = \text{172 g salt}$

3. Calculate the mass of salt in the spent water

$\text{Mass of salt} = \text{1000 g water} \times \dfrac{\text{15 g salt}}{\text{100 g water}} = \text{150 g salt}$

4. Mass of salt remaining in washed oil

Mass = 172 g - 150 g = 22 g

5. Concentration of salt in washed oil

$\text{Concentration} = \dfrac{\text{22 g}}{\text{3440 g}} \times 100 \, \% = \mathbf{0.64 \, \%}\\\\\text{The concentration of salt in the washed oil is $\large \boxed{\mathbf{0.64 \, \%}}$}$