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3 years ago

In which group would the atom be lobe along based on its valence electrons on the periodic table

Chemistry

1 answer:

choli [55]3 years ago

4 0

Answer:

Electrons in the outermost shell are called valence electrons, because it is their interactions that determine the chemical properties of an element. The columns that were set up to group elements by similar chemical properties turn out to be the exact same columns defined by the number of valence electrons.

Explanation:

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The electron configurations of two unknown elements X and Y are shown . X: 1s^ 2 2s^ 2 2p^ 6 3s^ 1 Y: 1s^ 2 2s^ 1 Which statemen

PIT_PIT [208]

Answer:

See below.

Explanation:

They both have 1 valency electron so will be metallic and in the same Group (Group 1) of the Periodic Table, so will have similar properties.

8 0

3 years ago

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An unknown material has a mass of 5.75 g and a volume of 7.5 cm3.

Shtirlitz [24]

Hey there!:

Mass = 5.75 g

Volume = 7.5 cm³

Therefore:

Density = mass / volume

D = 5.75 / 7.5

D = 0.7 g/cm³

Answer C

Hope that helps!

3 0

3 years ago

3. Determine the moles of sodium, Na, containing 7.9x1024 atoms.

-BARSIC- [3]

Answer:

12.7mol Na.

Explanation:

Hello there!

In this case, according to the concept of mole, which stands for the amount of substance, we can recall the concept of Avogadro's number whereby we understand that one mole of any substance contains 6.022x10²³ particles, for the given atoms of sodium, we can calculate the moles as shown below:

$7.9x10^{23}atoms*\frac{1mol}{6.022x10^{23}atoms} \\\\$

Thus, by performing the division we obtain:

$12.7molNa$

Regards!

8 0

3 years ago

PLEASE HELP

earnstyle [38]

Answer:
Cp = 0.093 J.g⁻¹.°C⁻¹
Solution:

The equation used for this problem is as follow,

Q = m Cp ΔT ----- (1)

Where;
Q = Heat = 300 J

m = mass = 267 g

Cp = Specific Heat Capacity = ??

ΔT = Change in Temperature = 12 °C

Solving eq. 1 for Cp,

Cp = Q / m ΔT

Putting values,
Cp = 300 J / (267 g × 12 °C)

Cp = 0.093 J.g⁻¹.°C⁻¹

6 0

3 years ago

Write down the formula for B<br> example:<br> Hydrogen + Fluorine = Hydrogen Fluorine <br><br> help

Tom [10]

Answer:

P³⁻ + Cl⁻ --> PCl₃

Explanation:

PCl₃: phosphorus trichloride. prefix in front of chloride is "tri"–meaning three.

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3 years ago

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In which group would the atom be lobe along based on its valence electrons on the periodic table ​

In which group would the atom be lobe along based on its valence electrons on the periodic table