The formula is density = mass / Volume
density = ?
mass = 21 g
Volume = 9 mL
d = m / V
d = 21 g / 9 mL
d = 2.3 g/mL
Hope this help!
Answer:
Explanation: ques 8
I think so it is a hydrogen atom ,because it is only atom atom that has 1 proton .as the question is to identify the atom with no of proton so it is hydrogen . it has atomic number 1
ques 9
the isotpoe of hydrogen having 2 neutrons is caled tritrium . it has mass number 3
ques no 10
as the protons are present in nucleus and electrons revovle around it so the term is clear . remember atoms do not have defined boundaries .
39 J
P=Fd/t i belive is the answer
Answer:
15
Explanation:
because since the outer shell has 5 electron then add 5 and 10 to get 15