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3 years ago

An atom has 5 electrons in its outer shell. how many unpaired electrons does it have?

Chemistry

1 answer:

lions [1.4K]3 years ago

4 0

The answer is 3.

That is if an atom has 5 electrons in its outer shell, then it has 3 unpaired electrons.

As the outer shell have 1 s orbital too and that is fully filled and not available for bonding so it must have 3 unpaired electrons.

So the number of unpaired electrons in an atom that is having 5 electrons in its outer shell is 3.

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Suppose a piece of silver jewelry contains 7.49x10^22 atoms of silver (Ag). how many moles of silver are in the jewelry?

zalisa [80]

Answer:

0.124 mol Ag

General Formulas and Concepts:

Atomic Structure

Moles

Stoichiometry

Using Dimensional Analysis

Explanation:

Step 1: Define

[Given] 7.49 × 10²² atoms Ag

[Solve] mol Ag

Step 2: Identify Conversions

Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Step 3: Convert

[DA] Set up: $\displaystyle 7.49 \cdot 10^{22} \ atoms \ Ag(\frac{1 \ mol \ Ag}{6.022 \cdot 10^{23} \ atoms \ Ag})$
[DA] Divide [Cancel out units]: $\displaystyle 0.124377 \ mol \ Ag$

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

0.124377 mol Ag ≈ 0.124 mol Ag

Topic: AP Chemistry

8 0

3 years ago

What is the difference between ionic and covalent bonds? Give an example of a each type

Norma-Jean [14]

Answer:

Ionic bonds are opposite, whereas Covalent bonds are opposite.

Explanation:

Two opposite ions attract each other and form the ionic bond. Covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and othercovalent bonds.

Examples:

Sodium Chloride and Sodium Fluoride are examples of Ionic bonds.

and

Water and Carbon Dioxide are examples of Covalent bonds. 

4 0

4 years ago

What is the frequency of electromagnetic radiation with a wavelength of 6.34 x 10^8 m?

Svetllana [295]

<h2>Answer: 4.72 × 10⁷ s⁻¹ or Hz</h2><h3> Explanation: </h3>

frequency = speed of light ÷ wavelength

frequency = (2.99 × 10⁸ m/s) ÷ (6.34 × 10⁸ m)

= 4.72 × 10⁷ s⁻¹ or Hz

8 0

3 years ago

Isotopes:

ozzi

A. Of a given element have different numbers of neutrons

3 0

4 years ago

Identify the oxidizing agent and the reducing agent for 4Li(s) + O_2 (g) to 2Li_2O(s).

Doss [256]

The reaction is:

4Li(s) + O2 (g) = 2Li+ + 2O-2(s).

The oxidizing agent is the one that is being reduced which is oxygen where the charge changed from neutral to -2 while the reducing agent is the on being oxidized which is lithium where the charge change from neutral to +1.

7 0

3 years ago