Atoms and Molecules 🌷 Flashcards
What is the smallest unit of an element?
Atom
True or False: Molecules are made up of two or more atoms bonded together.
True
Fill in the blank: The central part of an atom is called the ______.
nucleus
What particles are found in the nucleus of an atom?
Protons and neutrons
What is the charge of an electron?
Negative
Which subatomic particle determines the atomic number of an element?
Proton
What term describes the number of protons in the nucleus of an atom?
Atomic number
True or False: Isotopes have the same number of protons but different numbers of neutrons.
True
What is a molecule made up of two or more different elements called?
Compound
True or False: Electrons are much heavier than protons.
False
What is the mass number of an atom?
The sum of protons and neutrons in the nucleus
What is a chemical formula?
A representation of a substance using symbols for its constituent elements
What does the subscript in a chemical formula indicate?
The number of atoms of an element in a molecule
What is the difference between an element and a compound?
An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded.
True or False: All molecules are compounds.
False
