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3 years ago

Electrons located in the outermost shell of an atom are called

Chemistry

2 answers:

VLD [36.1K]3 years ago

8 0

Answer:

Valence electrons

Explanation:

Valence electron is the number of electrons in the outermost shell of an atom. Valance electrons are equal to the group number of the elements in the periodic table. For example, halogens are located in group 7 of the periodic table, and they have 7 valence electrons. Also alkali metals located in group 1 have 1 valence electron. In the formation of an ionic bond valence electrons are either lost or gained, and in covalent bonds valence electrons are shared.

Varvara68 [4.7K]3 years ago

7 0

Valence electrons are the electrons located in the outermost shell

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How many sodium ions are in 4543.3 g of NaCl?

Stella [2.4K]

Answer:

4.68x10²⁵ ions of Na⁺

Explanation:

First of all, we dissociate the salt:

NaCl(aq) → Na⁺(aq) + Cl⁻(aq)

An aqueous solution of NaCl dissociates in chlorides anions and sodium cations. Ratio is 1:1, per 1 mol of NaCl, we have 1 mol of Na⁺

We determine the moles of salt: 4543.3 g . 1mol / 58.45 g = 77.7 moles

77.7 moles are the amount of NaCl, therefore we have 77.7 moles of Na⁺.

We count the ions:

1 mol fo Na⁺ has 6.02x10²³ ions

77.7 moles of Na⁺ must have (77.7 . 6.02x10²³) / 1 = 4.68x10²⁵ ions of Na⁺

3 0

3 years ago

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Gamma rays are negatively charged.

asambeis [7]

Answer:

True

Explanation:

8 0

3 years ago

400. mg of an unknown protein are dissolved in enough solvent to make 5.00 mL of solution. The osmotic pressure of this solution

ch4aika [34]

<u>Answer:</u> The molecular weight of protein is $1.14\times 10^2g/mol$

<u>Explanation:</u>

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

$\pi=iMRT$

or,

$\pi=i\times \frac{m_{solute}\times 1000}{M_{solute}\times V_{solution}\text{ (in mL)}}}\times RT$

where,

$\pi$ = Osmotic pressure of the solution = 0.0861 atm

i = Van't hoff factor = 1 (for non-electrolytes)

$m_{solute}$ = mass of protein = 400 mg = 0.4 g (Conversion factor: 1 g = 1000 mg)

$M_{solute}$ = molar mass of protein = ?

$V_{solution}$ = Volume of solution = 5.00 mL

R = Gas constant = $0.0821\text{ L atm }mol^{-1}K^{-1}$

T = temperature of the solution = $25^oC=[25+273]K=298K$

Putting values in above equation, we get:

$0.0861atm=1\times \frac{0.4g\times 1000}{M\times 100}\times 0.0821\text{ L. atm }mol^{-1}K^{-1}\times 298K\\\\M=1136.62g/mol=1.14\times 10^2g/mol$

Hence, the molecular weight of protein is $1.14\times 10^2g/mol$

4 0

3 years ago

What is the difference between polar and non-polar

ExtremeBDS [4]

Answer:

Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.

Explanation:

5 0

3 years ago

Archeologists have discovered the scapula ulna And metacarpals of an ancient human skeleton what part of the body have they foun

Kay [80]

The forelimb

Explanation:

The skeletal system is made up of the bones of the human body which provides protection for vital organs in the body. It also serve as a surface for the attachment of muscles through which movement is coordinated.

There are different bones in the body.

The forelimb is made up of the:

Scapula
Humerus
Ulna
Radius
Carpals
Metacarpals

These bones are jointed together to form our arm. If an archaeologists digs up any of the bones, he/she has unraveled some of the bones of the forelimb.

Learn more:

Archaeology brainly.com/question/4675659

#learnwithBrainly

3 0

3 years ago

Read 2 more answers