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8th GradeSci Central

Properties of Atoms and the Periodic Table

What is the smallest piece of matter that still retains the properties of the element? atom
What are atoms of the same element that have different numbers of neutrons? isotope
What is the smallest known particle that makes up protons and neutrons? quark
What are the positively charged particles in an atom called? proton
What is the region called that is outside of the nucleus where the electrons are found? electron cloud
What are the neutral particles in the nucleus of the atom called? neutrons
What are the negatively charged particles in an atom called? electrons
What is the center of the atom that contains the protons and neutrons called? nucleus
What is the table of elements arranged according to repeated changes in properties called? Periodic Table
The horizontal row in the periodic tables is called what? period
What is the name for the elements found in the middle part of the periodic table? These elements are in families 3-12. transitions elements
What is the vertical column in the periodic table called? group or family
What are the elements that are found to the right if the zigzag dividing line in the periodic table? nonmetals
What is the number on the periodic table that represents the number of protons in an atom? atomic number
What are the elements that have properties of both metals and nonmetals? metalloids
What is the number on the periodic table that is the weighted average mass of the mixture of isotopes that exists naturally for an element? average atomic mass
What are the elements that are found on the left side of the periodic table or left of the zigzag dividing line? metals
What is the sum of the number of protons plus neutron in the nucleus? mass number
Who is the ancient Greek who first said that all matter was made of small indivisible particles called “atomos”? Democritus
Who is the Father of modern atomic theory? With his experiments in the 1800s, he showed that all elements have atoms as their smallest particle. Dalton
Who discovered electrons with a cathode ray tube experiment in 1904? Thompson
Who discovered the positive nucleus at the center of atoms with a gold foil experiment in 1911? Rutherford
Who showed that through light spectroscopy that electrons existed in specific energy levels in 1913? Bohr
What is the current atomic model that has electrons not as particles in orbits, but as wave-particles in areas of probability? Electron Cloud Model
Who created the first periodic table based on increasing atomic mass? Mendeleev
Who put the periodic table in order by atomic number? Moseley
What are most of the synthetic elements called? rare earth elements
Each energy level of an atom can hold a maximum number of what? electrons
What are Lewis Electron Dot diagrams used to represent? outer level electrons
What does the chemical symbol of an element represent? name of the element
In what state are most elements at room temperature? solid
What unit is used to measure the size of an atom? Angstrom
How do scientists know what an atom looks like if he can’t see it in detail? They use experiments involving indirect observations to create a model.
What two things did Mendeleev use to arrange the periodic table? a. He ordered them according to increasing mass. b. He grouped them according to similar properties.
What are 2 similar properties of Na and K? They are both soft metals that react with water.
What makes Na and K so similar? They both contain the same number of electrons in the outer energy level.
Created by: mtoutant