Hey there!
Atomic number is the number of protons.
Atomic mass is the sum of protons and neutrons.
9 + 11 = 20
Your answer is B) The atomic number is 9 & the atomic mass is 20.
Hope this helps!
Answer: sorry can't help ya
Explanation:
Sorry it's just I don't really know how to answer this question myself wish you the best of luck ;3
<span>c.
reactivity
this is a physical property depends on how reactive something is</span>
Density=mass / volume
Data:
mass=30.0 g
volume=volume with rock - volume without rock=27.6 ml - 22.3 ml=5.3 ml
1 ml=cm³ ⇒ 5.3 ml=5.3 cm³
Therefore:
Density=30.0 g / 5.3 cm³=5.66 g/cm³
Answer: density = 5.66 g/cm³
Environmental Effects of Urbanization. Urban people can change their environment with the most basic needs. Food, energy, water, land, garbage. And in return. It can pollute the environment when it is not recycled right. Damaging health and quality of life.
