C2. Atoms, elements and compounds Flashcards
(29 cards)
What is an atom?
An atom is the smallest unit of an element
What are the subatomic particles that make up an atom?
An atom consists of protons
Where are protons
neutrons
What is the charge of a proton?
A proton has a positive charge.
What is the charge of an electron?
An electron has a negative charge.
What is the charge of a neutron?
A neutron has no charge (it is neutral).
What is the atomic number of an element?
The atomic number is the number of protons in an atom of an element
What is the mass number of an element?
The mass number is the total number of protons and neutrons in an atom’s nucleus.
How do you calculate the number of neutrons in an atom?
The number of neutrons is calculated by subtracting the atomic number from the mass number.
What is an element?
An element is a substance made up of only one type of atom
What is a compound?
A compound is a substance formed when two or more different types of atoms chemically bond together.
How are atoms held together in a compound?
Atoms in a compound are held together by chemical bonds
What is a molecule?
A molecule is two or more atoms bonded together
What is the difference between an element and a compound?
An element consists of only one type of atom
What is a chemical formula?
A chemical formula represents the elements in a compound and the number of atoms of each element in a molecule of the compound.
What is an ionic bond?
An ionic bond is formed when one atom gives up one or more electrons to another atom
What is a covalent bond?
A covalent bond is formed when two atoms share one or more pairs of electrons to achieve a full outer electron shell.
What is a mixture?
A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.
What is a simple molecular substance?
A simple molecular substance is made up of small molecules held together by covalent bonds
What is the difference between a mixture and a compound?
A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.
What is the periodic table?
The periodic table is a chart that arranges elements based on their atomic number and their chemical properties
What are the groups in the periodic table?
The groups are the vertical columns in the periodic table
What are the periods in the periodic table?
The periods are the horizontal rows in the periodic table
What are isotopes?
Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons
