Calcium’s atomic number is 20. it forms ions with 18 electrons. what is the electrical charge of a calcium ion?

1 answer:

6 0

It would be a positive charge because it lost two electrons, if the charge was neutral it would be the same amount of protons and electrons, if the charge was negative the electrons would be 20 instead of 18. So in this case it is positive.

You might be interested in

Would the size of an item affect whether or not it is flammable?

pochemuha

Answer:

No! It only depends on the chemicals in or on the object.

Explanation:

Hope this helped! :)

5 0

3 years ago

What is a specialised cell?

Arlecino [84]

Answer:

Hello, how is your day?

Explanation:

Specialised cells have a specific role to perform. Each specialised cell has a different job to do. They have special features that allow them to do these jobs. Muscle cells, for example, are held together in bundles, which pull together to make muscles contract.

8 0

3 years ago

A 2.0 mL sample of air in a syringe exerts a pressure of 1.02 atm at 22 C. If that syringe is placed into boiling water at 100 C

emmainna [20.7K]

Answer: The new volume of the air in the syringe is 7.3 mL.

Explanation:

Given: $V_{1}$ = 2.0 mL, $P_{1}$ = 1.02 atm, $T_{1} = 22^{o}C$

$V_{2}$ = ?, $P_{2}$ = 1.27 atm, $T_{2} = 100^{o}C$

Formula used to calculate the new volume in syringe is as follows.

$\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}$

Substitute the values into above formula as follows.

$\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\\\frac{1.02 atm \times 2.0 mL}{22^{o}C} = \frac{1.27 atm \times V_{1}}{100^{o}C}\\V_{1} = 7.3 mL$