When comparing structures of the squares on the table.... atoms that have a different number of neutrons than protons are called isotopes... They may take on new forms of that element. Ex. Carbon 12, Carbon 14
State Content Standards
3.2.7.A1 Properties of Matter: Identify groups of elements that have similar properties
*Explain how materials are characterized by having a specific amount of mass in each unit of volume (density)
3.2.7.A2 Structure of Matter atoms as the basic building blocks of matter and that elements are composed of one type of matter
Teacher guide- New Teachers
This chart reflects groups 1-2-14-15-16-17-18 no lanthanides or actinides. I do not teach the transition metals to 7th grade.
Procedure- Subtract the number of protons from the atomic mass and this tells you your number of neutrons. If the neutron number is the same as the proton number the atom is not an isotope.
Today's standards are vast. Inquiry wants us building and not spending months on one area. Touch on it each year and scaffold. By grade 8 you will have achieved mastery.