Answer:
The Answer is D. principle of original horizontally
An atomic mass unit is a unit of measurement that is used to measure the mass of atoms. The atomic mass unit (abbreviated: amu or u) is roughly equal to the mass of 1 proton<span> or 1 neutron. The unified atomic mass unit and the dalton are different names for the same thing. The dalton name is used more over time.</span>
The answer would just be:
<span>Tungsten
</span>hope that this helps you! =)
In ions atoms lose and gain electrons
