Practice problem
Atomic Mass — Definition & AMU

Image source: By 2012rc CC BY 2.0, via Wikimedia Commons
An atom is found to have a mass of 40 AMU. It is known to have 22 neutrons and 15 electrons. What element is it?
Practice problem

Image source: By 2012rc CC BY 2.0, via Wikimedia Commons
An atom is found to have a mass of 40 AMU. It is known to have 22 neutrons and 15 electrons. What element is it?