Which of the following atoms has the same number of neutrons as 19F?

16O

18F

20Ne

23Na

Question

Which of the following atoms has the same number of neutrons as 19F?

 16O

 18F

 20Ne

 23Na

sarahc · Answer

Im thinking c?

anonymous · Answer

19 F has 19 - 9 = 10 neutrons

20 Ne = 20-10 = 10

anonymous · Answer

correct its C

sarahc · Answer

thank you!

anonymous · Answer

post this in chemistry, not math.

anonymous · Answer

19 F has 19 - 9 = 10 neutrons
 
O: 16-8 =8
 
Ne = 20-10 = 10
 

ANSWER: Neon!!

sarahc · Answer

I have another :) An element has three naturally occurring isotopes. Use the information below to calculate the weighted average atomic mass of the element, showing both the setup and the final answer for the calculation.

Isotope

Atomic Mass

Percent Abundance

X

1.01 u

99.984%

Y

2.01 u

0.014%

Z

3.02 u

0.002%

sarahc · Answer

@surdawi

anonymous · Answer

average atomic mass of the element= 1.01(99.984/100) + 2.01(0.014/100) + 3.02(0.002/100) = 1.01 u