Question 12 is Noble gas and question 13 is actinide-series element.
The answer is despoil products could you mark me as brainlyestw
Answer:
Lithium 7
Explanation:
An isotope is based off the number of neutrons present 3+4=7
Look on the periodic table to find the element number
Answer:
69.4kg
Explanation:
mole =volume/1000 * mole conc.
=1250/1000 * 0.75
mole =0.9
:• mole =mass /molar mass
mass =0.9*[40+32+2]
=69.4kg
The answer is B. Decreasing the cylinder volume decreases the amount of space the gas has to occupy there for increasing pressure