Answer is (1) - less mass and greater penetrating power.
Alpha particle is a ₂⁴He nucleus while beta particles are electrons. Hence, the mass of alpha particle is greater than the mass of beta particle. But, the penetrating power is higher in beta particle than alpha particle. Alpha particles can be blocked by few papers but beta particles can go through those papers.
Explanation:
Mike drives his car 60 km in 55minutes. What is its average speed in kilometers per hour ? A train travels 120 km in 2 hours and 30 .
Answer:
a covalent would be the two that are nonmetals
The answer would be .40008L
The word milli- translates to

units. In this case, we have liters as our base unit. So a milliliter is

Liters or you can say that there are:
1,000 mL in 1 L.
As I understand, you are trying to convert 400.08mL to L.
So this is how you are going to get it:

x

=
According to the periodic table, carbon's molar mass is 12.011 grams per mole (that's the small number under the element). So, just multiply like this to get the answer:

So, there are approximately 0.208 grams in 2.5 moles of carbon.