who am I Flashcards
What is an atom?
An atom is the basic unit of matter that consists of a nucleus surrounded by electrons.
True or False: Atoms can be created and destroyed in chemical reactions.
False
What are the three main subatomic particles of an atom?
Protons, neutrons, and electrons.
Fill in the blank: The atomic number of an element is determined by the number of ______ in its nucleus.
protons
Which particle has a positive charge?
Proton
What is the charge of a neutron?
Neutral
What is the periodic table?
A tabular arrangement of chemical elements organized by increasing atomic number.
True or False: Elements in the same group of the periodic table have similar chemical properties.
True
What does the period number in the periodic table indicate?
The number of electron shells in the atoms of the elements in that row.
Which element has the atomic number 1?
Hydrogen
What is an isotope?
Atoms of the same element with the same number of protons but different numbers of neutrons.
Fill in the blank: The elements in group 18 of the periodic table are known as ______ gases.
noble
What is the most abundant element in the universe?
Hydrogen
Which particles are located in the nucleus of an atom?
Protons and neutrons.
True or False: Electrons are much heavier than protons.
False
`What is the significance of the atomic mass?
It represents the weighted average mass of an element’s isotopes.
What does the term ‘valence electrons’ refer to?
Electrons in the outermost shell of an atom that determine its chemical properties.
Which element is represented by the symbol ‘O’?
Oxygen
What are alkali metals?
The group of elements in group 1 of the periodic table, known for their reactivity.
Fill in the blank: The number of protons in an atom is called its ______ number.
atomic
What is the octet rule?
Atoms tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons.
Which two elements are required to form water?
Hydrogen and oxygen.
What is a chemical bond?
A lasting attraction between atoms that enables the formation of chemical compounds.
True or False: The periodic table is static and does not change over time.
False
What are transition metals?
Elements found in groups 3-12 of the periodic table that have variable oxidation states.
What is the difference between a compound and a mixture?
A compound is a substance formed from two or more elements chemically bonded, while a mixture is a combination of substances that retain their individual properties.
