Atoms
The nucleus of an atom is made of
protons and neutrons
The modern Periodic Table is arranged by
atomic number
The element hydrogen uses the symbol
H
511B-1 represents a form of Boron with a _____ charge.
negative
Three main branches of science include
earth, life, and physical
Electrons can be found in the
electron clouds
Elements running vertically (up and down) are referred to as families or
groups
compounds
Carbon - 14 is a _____ of Carbon.
Isotope
A molecule has _____ or more atoms of the same or different elements.
two
empty space
As you move from left to right on the Periodic Table the number of valence electrons increase by
If an element adds a proton, then it becomes a(n)
new element
1123Na+2 is an isotope of sodium with an neutron number of _____.
12
A _____ is an educated guess or prediction when using the scientific method.
hypothesis
A neutral atom has
equal number of protons and electrons
On a Periodic Table the elements often use letters to represent the element, they are referred to as
symbols
_____ are pure substances, which cannot be broken down into smaller substances.
37Li-1 has an atomic number of _____.
As you move down and two the right on the Periodic Table, an element's reactivity _____.
increases
The greatest amount of mass of an atom is located
in the nucleus
Noble Gases are often stable and found on the
right side
A single particle of an element is known as a _____.
atom
negative
When you move further away from the nucleus, an electrons _____ increases.
energy