nucleus outside smallest inside electrons neutral element neutrons largest atom. Atoms are the smallest unit of an ______. Within the atom is a _______which is the center of the atom. The_____ and neutrons are located within the_______. The ______are outside the nucleus. The neutron has a_______ charge. A helium atom is the _______unit of an element. The element helium has a mass of _______. A helium atom has_______ protons and _______neutrons. The electrons are located on the ______of the_________.
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Atoms are the smallest unit of an element. Within the atom is a nucleus, which is the center of the atom. The protons and neutrons are located within the nucleus. The electrons are outside the nucleus. The neutron has a neutral charge. A helium atom is the smallest unit of an element. The element helium has a mass of 4 atomic mass units (AMU). A helium atom has 2 protons and 2 neutrons. The electrons are located on the outside of the nucleus.