Math
Atoms
Periodic Table
Concepts
Vocab
100
Chlorine has an atomic number of 17 and mass number of 35. How many neutrons are in its nucleus?
18 neutrons
100
A neutron has what charge?
Neutral
100
Columns on the period table are called
Groups/families
100
Draw the electron arrangement for an element with 15 electrons
100
What is the center of the atom called
Nucleus
200
How many protons are in Calcium-42
20 protons
200
A proton has what charge?
positive
200
Rows on the periodic table are called
Periods
200
The lewis/dot structure shows:
All the electrons or only the valence electrons
only the valence electrons
200
smallest piece of matter that still retains the property of the element
Atom
300
The number of electrons that the first energy level can hold.
2 electrons
300
An electron has what charge?
Negative
300
Can be gases, liquids or solids; brittle; dull; nonconductive
Metals or Metalloids or Nonmetals
Nonmetals
300
What information does the atomic number give you?
How many protons and electrons there are.
300
Atoms of the same element that differ in their mass number are
Isotopes
400
Hydrogen-1 has 1 proton. How many protons does Hydrogen-2 have?
1
400
What two particles make up an atom's nucleus?
Protons and Neutrons
400
Name of the group/family of elements that have full outer energy levels and do not bond with other elements.
Noble Gases
400
How do you find the mass number of an atom?
Add the protons and neutrons.
400
Electrons found on the outer energy level are called
Valence electrons
500
A carbon atom with 6 protons, 6 electrons and 6 neutrons would have a mass number of?
12 amu
500
How does the mass of an electron compare to the mass of protons and neutrons?
Much smaller
500
Group/Family 1 on the periodic table that consist of very soft reactive metals with one valence electron are called
Alkali metals
500
An atom is electrically neutral because
the protons (positive) and the electrons (negative) are the same number and cancel each other out
500
What is the unit for the mass of an atom?
atomic mass unit (amu)