Answer: magnet, fridge and uh......metal
Explanation:
Answer : Average atomic weight of copper atoms will be
63.62 u.
Explanation : For calculating average atomic weight for any given atom we use this formula,
m = Σ

X % abundance
where, m - avg atomic mass of isotope.
and

- mass of isotope
on solving we get,
m = [63 u X (69/100)] + [65 u X (31/100)] = 63.62 u.
True because it seems that is like a pattern it's always 6
Kc= (nh4)
--------
(nh3) + (h2o)