What are the horizontal rows of the periodic table called?
Quick Answer
On the periodic table, the seven horizontal rows are called periods. On the left-hand side of the periodic table, the row numbers are given as one through seven. Moving across a period from left to right, the atomic number of the elements increases.
Continue ReadingFull Answer
Rows six and seven contain elements called transition elements, which are subdivided into the actinide and lanthanide series. While the elements numbered 58 through 71 are the lanthanide series, elements with the numbers 90 through 103 are the actinide series.
The vertical columns on this table are called groups. Groups are sometimes called families because the elements in them share certain physical and chemical properties. In the older system, these groups were given the Roman numerals I through VIII. In the new system, they are designated as groups 1 through 18.
Learn more about Atoms & MoleculesRelated Questions
-
Q:
What does the periodic table tell us?
A: The Periodic Table offers basic information about each one of the known chemical elements. Each element has its own box in the table, and these boxes inclu... Full Answer >Filed Under: -
Q:
How can I fill in a periodic table?
A: The periodic table can be filled by tabulating elements in order of increasing atomic number. This method was first devised by Russian chemist Dmitri Ivano... Full Answer >Filed Under: -
Q:
What happens when electrons lose energy and return to their initial or ground state?
A: Electrons sometimes absorb energy and shift to an excited state for short periods of time. When they lose the excess energy, the energy is released as a ph... Full Answer >Filed Under: -
Q:
Why do atoms get smaller across a period?
A: Moving across periods on the periodic table from left to right, the atoms tend decrease in radius size because each atom has more protons than the atom bef... Full Answer >Filed Under:
