Which description of nitrogen-15 is correct?
a) atomic number = 15; atomic mass number...
Which description of nitrogen-15 is correct?
a) atomic number = 15; atomic mass number = 7; number of neutrons = 8
b)atomic number = 8; atomic mass number = 15; number of neutrons = 7
c)atomic number = 8; atomic mass number = 7; number of neutrons = 7
d)atomic number = 7; atomic mass number = 15; number of neutrons = 8
Answers: 2
Chemistry, 23.06.2019 01:00, zitterkoph
Which of the following is a physical change? a. burning a piece of wood b. sawing a piece of wood in half c. rust forming on an iron fence d. a copper roof changing color from orange to green
Answers: 1
Chemistry, 23.06.2019 02:00, raulflores01
Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium
Answers: 1
Mathematics, 12.08.2020 06:01
Mathematics, 12.08.2020 06:01