Chemistry -- Chapters4/5: Atoms & the Periodic Table (completion)

Complete each statement.


The word atom comes from a Greek word that means “unable to be ____________________.”



Most atoms have equal numbers of ____________________ and ____________________.



A region in which there is a high probability of finding an electron is called a(n) ____________________.



An element’s average atomic mass refers to the weighted average of the masses of all of its naturally occurring ____________________.



The ____________________ in ____________________ of 1 mole of a substance equals its molar mass.



The number of particles in one mole of a substance is referred to as ______________________________.



The nucleus of an atom has a(n) ____________________ electric charge.



Isotopes of an element have the same atomic ____________________ but different atomic ____________________.



The ____________________ is the SI unit that is used for counting small particles, such as atoms.



The molar mass of krypton is 83.80 g/mol. The mass of 5.00 mol of krypton is ____________________ g.



The number of energy levels that are filled in atoms is determined by the number of ____________________.



An atom gains energy by absorbing a light particle called a(n) ____________________.



The first person who suggested that matter was made up of atoms was the Greek philosopher ____________________.



Neutrons and protons are found in the ____________________ of an atom.



According to modern atomic theory, the exact location of a(n) ____________________ is uncertain.



An atom of potassium has an atomic mass of 39 u and an atomic number of 19. It therefore has ____________________ neutrons in its nucleus.



When an atom gains or loses energy, ____________________ jump between energy levels.



The chemical properties of an atom are determined by _________________________, which are located in the atom’s outer energy level.



An electron that gains energy enters an excited state and absorbs a particle of light called a(n) ____________________.



The order of elements in the periodic table is based on the number of ____________________ in the nucleus.



Because atoms of elements in the same group of the periodic table have the same number of _________________________, they have similar properties.



The most familiar semiconductor, ____________________, is one of the most abundant elements in Earth’s crust.



Neon is an inert gas because its outer _________________________ is full of electrons.



Group 17 halogens form compounds by gaining an electron to become _________________________.



One of the important ideas about Mendeleev’s periodic table was that he predicted new ____________________.



The periodic law states that, in the modern periodic table, elements with similar ____________________ appear at regular intervals.



A group’s elements react similarly because of their _________________________.



Some elements are highly ____________________ because their outermost energy levels are only partially filled.



Elements that are usually shiny are ____________________.



The elements in a family in the periodic table have similar ____________________ and ____________________ properties.



The ______________________________ are located in the center of the periodic table.



Noble gases are nonreactive gaseous elements that are located in Group ____________________ in the periodic table.



Elements called _________________________ can conduct heat and electricity under certain conditions



The _________________________ states that when elements are arranged by atomic number, elements with similar properties appear at regular intervals.



The number of valence electrons largely determines the ____________________ properties of each group in the periodic table.



The valence electron of a lithium atom is easily removed to form a lithium ____________________ with a charge of 1+.



Nonmetals are sometimes called ____________________ because they do not conduct heat or electricity well.



The metals are divided into three families, based on the number of ______________________________ they have.



Group 1 of the periodic table consists of the _________________________, a highly reactive group of elements.



The ____________________ are reactive elements in Group 17 in the periodic table.



Six elements called _________________________, or _________________________, are not metals but have some properties of metals.