Vocabulary
Define matter.
What is anything that has mass and takes up space?
According to the modern atomic theory, an atom has a center, or core, called the __________.
What is nucleus?
True or False: The atomic number of an element can be found on the periodic table.
What is True?
True or False: An element is a substance that can be chemically broken down into simpler substances.
What is False? (cannot)
True or False: Neutrons have a negative charge.
What is False? (neutral - no charge)
Define atom.
What is smallest part of an element that can be identified as that element?
The first scientist to declare that atoms contain small particles.
What is J.J. Thompson?
Be stands for which element on the periodic table?
What is Beryllium?
True or False: Helium is the third element on the periodic table.
What is False? (Second)
In a neutral atom, the number of ___________ equal the number of ___________.
What is protons and electrons?
Define molecule.
What is two or more atoms bonded together?
Scientist who discovered that an atom is mostly empty space.
What is Ernest Rutherford?
K stands for which element on the periodic table?
What is Potassium?
The first energy level's location is ____________
What is closest to the nucleus of an atom?
Name the model that focuses on the arrangement of the electrons in an atom.
What is The Bohr Model?
Define atomic number.
What is the number of protons in the nucleus of an atom?
Scientist who proposed the idea that electrons in an atom are found in different energy levels.
What is Niels Bohr?
Has an atomic number of 3.
What is Lithium?
This compound is used to flavor food.
What is sodium chloride?
Atomic Mass: total mass of the __________ and _____________ of an atom
What is protons and neutrons?
Chemistry is a science that deals with the ____________ and _____________ of substances and with the changes that they go through
What is structure and properties?
The modern model identifies the nucleus as containing ____________________________.
What is protons and neutrons?
The modern periodic table is organized according to this.
What is by increasing atomic number?
Elements in the same group share these characteristics.
What is chemical and physical properties?
Atomic mass is a decimal number that needs to be rounded up to the nearest whole number.
What is False? (Mass Number)