Solve the following problem with the correct number of significant figures. 5.31 cm + 8.4 cm + 7.932 cm

Multiple choice question.

A)
22 cm

B)
21.6 cm

C)
21.642 cm

D)
21.64 cm

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Asa choose the correct set of reaction coefficients to properly balance the following chemical equation according to the law of conservation of mass: __s8 + __o2 ==> __so2 1, 1, 8 1, 8, 1 1, 8, 8 8, 1, 1

What happens to isotopes that are unstable?