Answer: 18
Justification:
1) The most common ion of calcium is Ca 2+
2) That means that the atom, neutral calcium, has lost two electrons.
3) The atomic number of calcium is 20.
4) Atomic number is the number of protons, so calcium has 20 protons.
5) Therefore, the neutral atom of calcium also has 20 electrons (to make a net charge of zero).
6) Then, the ion Ca 2+ has 20 - 2 = 18 electrons.
Answer: 18 electrons.
A. because you haven't released the object so therefor the potential gravity force applied becomes actual when released.
Explanation:
Sand and iron fillings have the same size of particles.
It would be difficult to use a mesh to separate them. Also, sometimes , the iron filing clings well to the surface of the sand particles.
The best way to separate them is to use a bar magnet. The magnetic properties of the iron fillings will get it attracted to the bar magnet leaving the sand particles behind.
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Plant cells are rectangular or squarish in shape.
Plant cells have a large vacuole.
Answer:
The pressure of the gas will "increases by a factor of four."
Explanation:
The absolute zero in other words called as the absolute temperature. Whereas the absolute zero is the least possible temperature. In which nothing will remain cold and no heat can be released or present in the substance. When it is described in the figure it will be, –273.15 degrees Celsius on the Celsius scale. and 0 K on the Kelvin scale. This absolute temperature concept has been raised from the third law of the thermodynamics.
