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3 years ago

What do valence electrons determine about an element?

Chemistry

1 answer:

vekshin13 years ago

3 0

Its electronegativity and how easily it can bond with other elements or atoms.

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What mass of nitrogen is required to react with 16 grams of oxygen?

damaskus [11]

Answer:

14g

Explanation:

N2 + 2O2 => 2 NO2

Molar mass of O2 = 32g/mol

No of mol= 16/32 = 0.5 mol

2 moles of Oxygen react with 1 mol of N2

1 mol of oxygen react with X mol of N2

X = 0.5mol

Molar mass of N2 = 28g/mol

No of mol = mass/molar mass

Mass = 0.5 × 28 = 14g.

8 0

3 years ago

Write the condensed ground-state electron configurations of these transition metal ions, and state which are paramagnetic:

MAVERICK [17]

Answer and Explanation :

Paramagnetic are those which has unpaired electrons and diamagnetic are those in which all electrons are paired.

(a) V³⁺

The electronic configuration is -

$[Ar]3d^1$

The electrons in 3d orbital = 1 (Unpaired)

Thus, the ion is paramagnetic as the electrons are unpaired.

(b) Cd²⁺

The electronic configuration is -

$[Kr]4d^{10}$

The electrons in 4d orbital = 10 (paired)

Thus, the ion is diamagnetic as the electrons are paired.

The electronic configuration is -

$[Ar]3d^6$

The electrons in 3d orbital = 6 (Unpaired)

Thus, the ion is paramagnetic as the electrons are unpaired.

(d) Ag⁺

The electronic configuration is -

$[Kr]4d^{10}$

The electrons in 4d orbital = 10 (paired)

Thus, the ion is diamagnetic as the electrons are paired.

8 0

3 years ago

Which diagram shows the correct electron configuration for fluorine (F)?

sdas [7]

Answer:

it's A

Explanation:

The given element is, fluorine is a non-metal with symbol (F). It is a gas and belongs to the group 17 and period 2.

The atomic number of fluorine = 9

The number of electrons = 9

6 0

2 years ago

Read 2 more answers

Which type of bonds are formed when calcium atons react with oxygen atoms

borishaifa [10]

According the reaction with oxygen atoms the answer is Ionic bonds

6 0

4 years ago

calculate the atomic number of an element whose neutral atom has four electrons in its valence shell and its valence shell is th

insens350 [35]

Answer:

The atomic number of the atom is 14.

Explanation:

The following data were obtained from the question:

Valence electrons = 4

Atomic number =.?

From the question given, we were told that the valence electron is in the m shell. Thus, we can say:

M shell = 4 electrons

The number of shells of the atom can be written in the order K, L, M with M as the last shell because we were told that the valence electrons i.e electrons in the outer shell is located at the M shell.

From a detailed knowledge of atom,

K shell = 1st shell

L shell = 2nd shell

M shell = 3rd shell

The first shell, K of an atom can only accommodate 2 electrons while others can accommodate a maximum of 8 electrons.

Note: we can only put electrons in another shell if a shell is already having 8 electrons. This rule only applies to the 2nd shell and above.

Thus, the atom in question has the following electrons:

K shell = 1st shell = 2 electrons

L shell = 2nd shell = 8 electrons

M shell = 3rd shell = 4 electrons

To get the atomic number of the atoms, we simply add all the electrons together.

This is illustrated below:

Atomic number = 2 + 8 + 4

Atomic number = 14

Therefore, the atomic number of the atom is 14.

6 0

3 years ago