Atoms and the Periodic Table

What are the elements in the middle of the periodic table called?

What is the total number of protons and neutrons in the center called?

What is the smallest unit that protons and neutrons can be broken down?

What are the horizontal rows of elements called?

What are the particles that have a negative charge called?

What type of elements are found on the far left side of the periodic table?

The number of protons in an atom is the ?

What are elements that have some properties of metals and nonmetals called?

What are atoms of the same element but with different number of neutrons called?

What is the region around the nucleus that is where you can find electrons called?

What is the average of the masses of all the isotopes for an element called?

What are the vertical columns of elements called?

What is the center of an atom where protons and neutrons called?

What is the chart that shows the classification of elements called?

What are the letters used to represent an element called?