Describe the structure of an atom as a positively charged nucleus surrounded by negatively charged electrons.
Understand that the nuclear radius is significantly smaller than the overall atomic radius, and that almost all atomic mass is concentrated in the nucleus.
Recall that atomic nuclei consist of protons and neutrons, giving each element a characteristic positive nuclear charge.
Identify the relative masses and electrical charges of protons, neutrons, and electrons.
Define the atomic number as the number of protons in an atom, recognizing that atoms of the same element share the same number of protons.
Explain that atoms are electrically neutral overall because the number of electrons equals the number of protons.
Interpret and draw accurate scientific diagrams to represent the internal structure of atoms.
