Atom Basics
This is the center of an atom and contains protons and neutrons.
What is the nucleus?
This is an atom that has gained or lost electrons.
What is an ion?
Elements in this direction on the periodic table become more metallic.
What is left to right?
This property increases as you move from left to right across a period.
What is electronegativity?
This is the number of electrons in a neutral atom.
What is the atomic number?
These negatively charged particles orbit the nucleus of an atom.
What are electrons?
Atoms of the same element with different numbers of neutrons are called this.
What are isotopes?
These elements, found on the left side of the periodic table, are good conductors of electricity.
What are metals?
Elements that easily lose electrons to form positive ions are likely to have this character.
What is metallic?
The electrons in the outermost energy level of an atom are called this.
What are valence electrons?
This is the number of protons in an atom's nucleus.
What is the atomic number?
An ion with a positive charge has done this to its electrons.
What is lost electrons?
This group of elements on the far right of the periodic table is known for being unreactive.
What are noble gases?
The tendency of an atom to attract electrons in a chemical bond is called this.
What is electronegativity?
Most elements try to achieve this electron configuration through chemical reactions.
What is the octet rule (or noble gas configuration)?
These two subatomic particles have approximately the same mass.
What are protons and neutrons?
The mass number of an atom is equal to this.
What is the number of protons plus neutrons?
Elements in this area of the periodic table have properties of both metals and non-metals.
What are metalloids?
This group of elements is known for being highly reactive and forming 1- ions.
What are halogens?
This is the maximum number of electrons that can occupy the first energy level.
What is 2?
This type of model shows an atom's electrons as dots around the element symbol.
What is an electron dot diagram (or Lewis dot structure)?
An isotope of boron has a mass number of 10 and 5 protons. How many neutrons does it have?
What is 5?
This term describes elements in the same column of the periodic table.
What is a group (or family)?
This term describes how easily an element undergoes chemical reactions.
What is reactivity?
The number of valence electrons for elements in Group 18 (noble gases) is this.
What is 8 (except for helium, which has 2)?