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3 years ago

Which element has the same number of valence electrons as calcium?

Chemistry

1 answer:

kipiarov [429]3 years ago

8 0

Answer:

Barium has the same number of valence electrons as calcium

Explanation:

Valence electrons is the number of electrons of an atom on the outer shell.

Those valence electrons can participate in the formation of a chemical bond (if the outer shell is not closed); in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

Calcium is an atom, part of group 2, called the alkaline earth metals. The alkaline earth metals have 2 valence electrons.

Sulfur is part of a group 16, called the chalcogens or oxygen family. Those atoms have 6 valence electrons. They can form a bound with atoms of group 2 such as calcium, but do not have the same number of valence electrons.

Potassium is part of group 1, called the alkali metals or lithium family. Those atoms have 1 valence electrons. That means Potassium do not have the same number of valence electrons like calcium.

Neon is part of group 18, the noble gasses. Those are stable atoms, which means they have 8 valence electrons. They do not have the same number of valence electrons like Calcium.

Barium an atom, part of group 2, called the alkaline earth metals. The alkaline earth metals have 2 valence electrons. Calcium is also part of this group.

This means barium has the same number of valence electrons as Calcium.

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list the four quantum numbers from LAST electron of each of the following elements in their ground state: sodium, nitrogen, oxyg

Rasek [7]

Explanation:

The four quantum numbers gives the position of the orbital, its spatial orientation, the shape of the orbital and the spin of the an electron in the orbital.

The principal quantum number(n) gives the main energy level in which the orbital is located; n = 1,2,3,4....

Azimuthal or secondary quantum number (l) gives the shape of the orbitals an they take values l = 0,1,2,3.... and their names are s for 0, p for 1, d for 2 and f for 3.

Magnetic quantum number gives the spatial orientation or degeneracy of the orbitals in the subshell.

Spin quantum number gives the spinning of the electrons

Electronic configuration:

Na = 1s² 2s² 2p⁶ 3s¹

The last electron enters the 3s¹

n = 3

l = 0

m = 0

spin =+ or - $\frac{1}{2}$

N = 1s² 2s² 2p³

last electron enters 2p³

n = 2

l = 1

m = -1, 0, 1

spin = + or - $\frac{1}{2}$

O = 1s² 2s² 2p²

last electron enters 2p²

n = 2

l = 1

m = -1, 0, 1

spin = + or - $\frac{1}{2}$

Cl =1s² 2s² 2p⁶ 3s² 3p⁵

last electron enters 3p⁵

n = 3

l = 1

m = -1, 0, 1

spin = + or - $\frac{1}{2}$

S = 1s² 2s² 2p⁶ 3s² 3p⁴

last electron enters 3p⁴

n = 3

l = 1

m = -1, 0, 1

spin = + or - $\frac{1}{2}$

learn more:

Quantum number brainly.com/question/9288609

#learnwithBrainly

5 0

4 years ago

6. Which of the following pH values would have the highest concentration of hydroxide ions? *

jeyben [28]

pH. 10 because it is strong base

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3 years ago

A. List 3 signs that a chemical reaction occurred.

ioda

A. gas change, color change, and temperature change.

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6 0

3 years ago

A student added 500 mL of water to 200 mL of 0.20M NaCl solution. Which of the following is True?

tamaranim1 [39]

Option B is true , the same number of moles of solute in both solution is the same.

<h3>What is Molarity? </h3>

Molarity is the ratio of no of moles as per liter solution. It is denoted by M and SI unit is also M or moles/litre.

Molarity = no . Of moles/Volume (L)

In this question the amount of solution is increased means the volume is increased from 500-700ml it is increased , Molarity is inversly proportional of Volume

it will decrease if volume increase. Adding water do affect the concentration of the solution. The no. Of moles of solute remains because there no increament in amount of NaCl .

Hence ,option B is more correct

to learn more about Molarity click herehttps://brainly.com/question/27931587

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8 0

1 year ago

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Anestetic [448]

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3 years ago