Parts of the Atom
A subatomic particle with no electrical charge
Neutron
True or False: When reading the Periodic Table, the number of electrons of an element is usually equal to the atomic number.
True
On the Periodic Table of elements, what are the periods?
Horizontal rows
This element has an atomic number of 1
Hydrogen
The smallest unit in which an element can be divided and maintain its properties
the atom
Which subatomic particle has a negative charge?
Electron
What is the atomic number of an element?
The number of protons in the nucleus
On the Periodic Table of elements, what are the groups?
Elements that are usually hard, shiny, malleable, ductile, and good conductors of heat are called:
Metals
An atom is electrically neutral when it has
Equal numbers of protons and electrons
A positively charged subatomic particle found in the nucleus
Proton
How do I find the number of neutrons in an element?
Mass number (rounded atomic weight) - protons (atomic number)
How is the periodic table organized?
In order of atomic number, grouped by similar properties
Carbon-12 and Carbon-14 are examples of:
Isotopes
An atom with an unequal number of protons and electrons is called
An ion
What subatomic particles are found in the nucleus of an atom?
Protons and neutrons
The mass number of an atom is calculated by:
Adding protons and neutrons
The electron cloud model was developed by
Schrodinger
Elements that are usually soft and not malleable or ductile and are poor conductors of heat and electricity are called:
Nonmetals
All matter is composed of:
Atoms
Where are electrons located in an atom?
Orbiting around the nucleus
The atomic weight (atomic mass) of an element is:
The weighted average mass of the isotopes of an element
Which statement is part of Dalton's atomic theory?
A) Atoms can be created in chemical reactions
B) Atoms contain subatomic particles
C) Atoms of different elements are identical
D) Atoms are indivisible and indestructible
D) Atoms are indivisible and indestructible
Elements with full outermost electron shells that don't combine with other elements are known as?
Noble Gases
The subatomic particles in the outermost energy shell of an atom
Valence Electrons