Question 16 Which of the following is an example of a chemical property of matter?
А
reaction with another element
B
density of an element
C
color of an element
D
freezing point of element

Explanation:

A reaction with another element

other choices are physical property

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer