Barium is Group
I
I
, Period 6,
Z
=
56
. The last closest Noble Gas is
Z
=
54
. This is xenon.
Option d: copper.
Because copper is an element, not a mixture.
Answer:
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Explanation:
the 2nd choice
1) convert cm to m

2) sig figs
When making a bigger number smaller, the exponent will be a positive number.
The answer will be
×
meters after rounding