<span>B. type of matter that we cannot see but that we believe makes up more than 20% of the universe C. matter made of ordinary atoms, such as hydrogen or helium atoms </span>
Answer:
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The density of Ca will be between that of Mg and Sr
Explanation:
Ca, Mg and Sr are group II elements. They are called alkali earth metals. The correct order of the elements in this group are: Be, Mg, Ca, Sr, Ba and Ra.
Density is an intensive property of matter which describes the amount of matter(mass) per volume of a substance.
- Density varies proportionally with mass. The higher the mass, the higher its density.
- On the periodic table, atomic mass which the number of protons and neutrons in the nucleus of an atom increases down the group.
- This implies a progradation in the value of density down the group. Therefore one expects that the value of density of Ca will fall between that of Mg and Sr. It cannot be more than 2.6g/cm³ nor less than 1.74g/cm³.
Learn more:
density brainly.com/question/2658982
mass number brainly.com/question/2597088
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The answer is C) Volume . Kilograms is a for of measurement for weight and mass is kinda like weight but mass doesnt change no matter the place or planet.
Explanation:
A barrier present at the open sides of stair case and platforms that prevent falling is known as a banister.
This banister is very helpful for old people and children as they need a support to move upwards whether it is a stairways or a platform.
Also, a banister is not used by any particular age group. It is for the people as a support to prevent them from falling.
