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d1i1m1o1n [39]
3 years ago
14

In the third period of the periodic table, sodium is followed by magnesium, aluminum, silicon, and phosphorus. Which of these el

ements has the smallest atomic size?
A. sodium

B. magnesium

C. aluminum

D. silicon

E. phosphorus
Chemistry
2 answers:
AURORKA [14]3 years ago
6 0

Answer:

phosphorus

Explanation:

77julia77 [94]3 years ago
3 0

Answer:-

Phosphorus

Explanation:-

In the third period among the elements given, phosphorus is at the most right side among them in the periodic table.

We know that as we go from left to right in the periodic table, the atomic size decreases due to the increase in nuclear charge.

Hence phosphorus is the smallest among them

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Answer:

There must be two Chlorine atoms for every one Calcium atom in order to fulfill Chlorine's octet rule and pair Calcium's unpaired electrons.

Explanation:

Calcium has two unpaired electrons in its Lewis dot structure, while Chlorine has one unpaired electron.

<em>So why can't we just make a double bond for </em><em>one</em><em> Chlorine?</em>

Chlorine has seven valence electrons, so once it shares electrons with Calcium, the octet rule is accomplished, and no more pairs can be made.

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A gas has a density of 1.57 g/L at 40.0 °C and 2.00 atm of pressure. What is the identity of the gas?
Naddika [18.5K]

Answer:

Neon

Explanation:

Step 1: Given and required data

  • Density of the gas (ρ): 1.57 g/L
  • Temperature (T): 40.0°C
  • Pressure (P): 2.00 atm
  • Ideal gas constant (R): 0.08206 atm.L/mol.K

Step 2: Convert T to Kelvin

We will use the following expression.

K = °C + 273.15 = 40.0 + 273.15 = 313.2 K

Step 3: Calculate the molar mass of the gas (M)

For an ideal gas, we will use the following expression.

ρ = P × M/R × T

M = ρ × R × T/P

M = 1.57 g/L × 0.08206 atm.L/mol.K × 313.2 K/2.00 atm

M = 20.17 g/mol

The gas with a molar mass of 20.17 g/mol is Neon.

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