All categories

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.

You might be interested in

PLZ HELP!!!!!!!!!!!!!!!

natima [27]

Answer:

How cryolite is added to the electrolytic cell which is used to extract aluminium is that molten cyrolite dissolves the aluminium oxide, which is used for a lower temperature point than aluminium to extract it :3

Explanation:

8 0

3 years ago

A solution has [c6h5cooh] = 0.100 m and [ca(c6h5coo)2] = 0.200 m. ka = 6.3 × 10−5 for c6h5cooh. the solution volume is 5.00 l. w

Eddi Din [679]

6.8 is the pH of the solution after 10 ml of 5M NaOH is added.

Explanation:

Data given:

Molarity of C6H5CCOH = 0.100 M

molarity of ca(c6h5coo)2 = 0.2 M

Ka = 6.3 x 10^-5

first pH is calculated of the buffer solution

pH = pKa+ log 10 $\frac{[A-]}{[HA]}$

pKa = -log10[Ka]

pka = -log[6.3 x10^-5]

pKa = 4.200

putting the values to know pH of the buffer

pH = 4.200 + log 10 $\frac{0.2}{0.1}$

pH = 4.200 + 0.3

pH = 4.5 (when NaOH was not added, this is pH of buffer solution)

now the molarity of the solution is calculated after NaOH i.e Mbuffer is added

MbufferVbuffer = Mbase Vbase

putting the values in above equation:

Mbuffer = $\frac{MbaseVbase}{Vbuffer}$

= $\frac{5X10}{5000}$

= 0.01 M

molarity or [ A-] = 5M

pH = pKa+ log 10 $\frac{[A-]}{[HA]}$

pH = 4.200 + log 10 $\frac{5}{0.01}$

pH = 4.200+ 2.69

pH = 6.8

4 0

3 years ago

Read 2 more answers

I can be found in the 4th period on the periodic table.

Rainbow [258]

Vanadium (V)

Vanadium is the only one in the 4th period here so

4 0

3 years ago

Cohesion, adhesion, and surface tension are characteristics of water that ________. increase when pH increases increase when tem

Ray Of Light [21]

Answer:

are a result of hydrogen bonding.

Explanation:

The surface tension is the amount of energy required to stretch or increase the surface of a liquid by a unit area. Liquids that have strong intermolecular forces also have high surface tensions. Thus, because of hydrogen bonding, water has a considerably greater surface tension than most other liquids.

Another example of surface tension is capillary action. A thin film of water adheres to the wall of the glass tube. The surface tension of water causes this film to contract, and as it does, it pulls the water up the tube. Two types of forces bring about capillary action.

One is cohesion, which is the intermolecular attraction between like molecules (in this case, the water molecules). The second force, called adhesion, is an attraction between unlike molecules, such as those in water and in the sides of a glass tube. If adhesion is stronger than cohesion, the contents of the tube will be pulled upward. This process continues until the adhesive force is balanced by the weight of the water in the tube.

This characteristics of water are a consequence of a particularly strong type of intermolecular attraction, called the hydrogen bond, which is a special type of dipole-dipole interaction between the hydrogen atom in a polar bond, such as N-H, O-H, or F-H, and an electronegative O, N, or F atom.

8 0

3 years ago

Which of the following terms measures the amount of matter in an object? Weight or mass

Oksanka [162]

Mass measures the amount of matter in an object

3 0

4 years ago