Answer:
B
Explanation:
bronchi
epiglottis
plasma
Mittal
alveoli
I dont know the first blank but I know the second one is groups and the last one is periods.
Answer:b
radio waves
infrared radiation
visible light
ultraviolet radiation
X-rays
gamma rays
Answer: 0.405g
Molar Mass of Be = 9g/mol
Number of mole of Be = 0.045mol
Mass conc. Of Be = 0.045 x 9 = 0.405g