Here are 4 physical Properties of lanthanum
its
soft
malleable
ductile
and silver white colored metal.
The mass per volume of a substance is called its density.
Bonjour,
it’s cobalt(III) sulfate
Explanation:
Helium is produced in radioactive process that occurs in deep and underground formations. They differ from other atmospheric gases. These radioactive decay of heavier nuclides that are unstable started about the time when the earth was formed.
- As they decay they give off lighter particles that can easily be broken down into more stable ones.
- One of the main product of the decay is alpha particles.
- They have the same atomic structure as helium
- These materials are trapped in underground formations.
Hey there!
A half-life means after a certain amount of time, half of that substance will have decayed after that time.
There are 3 half-lives in 72,000 years because 72,000 ÷ 24,000 = 3.
So, we divide the 100g sample in half 3 times.
100 ÷ 2 = 50
50 ÷ 2 = 25
25 ÷ 2 = 12.5
There will be 12.5g of the radioactive sample remaining after 72,000 years.
Hope this helps!
