Elements vs. Compounds vs. Mixtures
This is a pure substance made of only one type of atom.
Element
This particle has a positive charge.
Proton
What does the atomic number tell you?
How many protons is in the element
The vertical columns on the periodic table are called ____.
Groups
These are shiny, good conductors of heat and electricity, and are usually malleable.
Metals
Water (H₂O) is an example of this.
Compound
This particle has no charge and is found in the nucleus.
Neutron
What does the chemical symbol “Na” stand for?
Sodium
The horizontal rows on the periodic table are called ____.
Rows
These are dull, brittle, and poor conductors.
Non-metals
Trail mix is an example of this type of matter.
Mixture (heterogeneous)
Which subatomic particle determines what element an atom is? Proton, neutron or electron
Proton. If we know the proton # then we know the atomic number and can find it on the periodic table of elements.
If an element has an atomic number of 8, how many protons does it have?
8 protons
Which group of elements is known as the “noble gases”?
Group 18
These elements have properties of both metals and nonmetals.
Metalloids
Which two are chemically bound, not physically—an element, compound, and/or mixture?
element/compound
If an atom has 11 protons, how many electrons does it have?
11 electrons
How do you find the number of neutrons in an atom?
Atomic mass-atomic number= # of neutrons
Which group contains very reactive metals like sodium and potassium?
Group 1: Alkali Metals
Give one example of a metalloid.
Boron (B)
Silicon (Si)
Germanium (Ge)
Arsenic (As)
Antimony (Sb)
Tellurium (Te)
Salt water is an example of this type of mixture, because it looks the same throughout.
Homogeneous Mixture
An atom has an atomic mass of 23 and 11 protons. How many neutrons does it have?
12 neutrons
The element with the symbol “K” has an atomic number of 19. How many electrons does it have?
19 electrons
What do elements in the same group have in common in terms of their outer (valence) electrons?
They have the same number of outer valence electrons
Most of the elements on the periodic table are which type: metals, nonmetals, or metalloids?
Metals