Chemistry Flashcards
Which subatomic particle has a positive charge?
Proton
What is the smallest particle of an element that retains the properties of that element?
Atom
What is the total number of protons in a helium atom?
2
Which subatomic particle has no charge?
Neutron
What is the atomic number of an element?
Number of protons in the nucleus
What is the mass number of an element?
Sum of protons and neutrons in the nucleus
What is the charge of an electron?
Negative
How many electrons can the first energy level of an atom hold?
2
What is the maximum number of electrons that can be in the second energy level of an atom?
8
What is the name for atoms of the same element with different numbers of neutrons?
Isotopes
Which subatomic particle is responsible for chemical bonding?
Electron
What is the charge of an atom that has gained an electron?
Negative
What is the charge of an atom that has lost an electron?
Positive
What is the number of valence electrons in a carbon atom?
4
What is the chemical symbol for oxygen?
O
How many electrons are in the outermost energy level of a nitrogen atom?
5
What is the molecular formula for water?
H2O
Which type of bond involves the sharing of electrons between atoms?
Covalent bond
What is the charge of an atom that has equal numbers of protons and electrons?
Neutral
What is the chemical formula for carbon dioxide?
CO2
What is the total number of electrons in a nitrogen atom?
7
Which element has 6 protons and 6 neutrons in its nucleus?
Carbon
How many electrons are in the second energy level of a sodium atom?
8
What is the chemical symbol for sodium?
Na
