Answer
47.88 u
The element is Ti (Titanium)
Work Step by Step
1. Calculate the average atomic mass:
$$( 0.0800 )( 45.95232 \space u)+( 0.0730 )( 46.951764 \space u)+( 0.7380 )( 47.947947 \space u)+( 0.0550 )( 48.947841 \space u)+( 0.0540 )( 49.944792 \space u)=47.88 \space u$$
2. The element with the closest average atomic mass is Titanium (Ti)
