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Atomic Theory and the Periodic Table Video Questions What is anything that has mass and takes up space? Who proposed that all matter is composed of small particles called atomos? Who is the Englishman that has proposed the current atomic theory? What two particles are found in the nucleus? What is the charge of a neutron? What do we call the negatively charged particles? Which has the smallest mass, a proton, a neutron, or an electron? Who is the Danish physicist who came up with the planetary model of the atom? Where are the electrons found? Specifically which particle distinguishes one atom from another? Who proposed the concept of the atomic number? What do we get as the sum of the number of protons and neutrons in an atom? What is the atomic number of sodium? What is the atomic mass of sodium? What did Meneleev order the elements by? What did Moseley order the elements by? What is the chemical symbol for magnesium? Where is one place the compounds of potassium are found? What is used in a pencil for writing? What do we call atoms of the same element with different numbers of neutrons? What are the vertical columns of the periodic table called? What are the horizontal rows of the periodic table called? What is found to the left of the stair step line on the periodic table? What is found to the right of the stair step line on the periodic table? Synthetic elements have an atomic number (not atomic mass as the videos says) greater than what?