Question

Place the letter of each of the above elements next to its description. Then, using a copy of the periodic table, write the element's name and symbol.

a) Atomic number
b) Mass number
c) Electron configuration
d) Isotope

Answer 1

The elements on the periodic table are represented by their symbol, atomic number, atomic mass, electron configuration, and isotopes.

The elements on the periodic table are represented by their symbol, atomic number, and atomic mass. The atomic number (a) represents the number of protons in the nucleus of an atom. The mass number (b) represents the total number of protons and neutrons in the nucleus. The electron configuration (c) refers to the arrangement of electrons in the energy levels of an atom. Isotopes (d) are different forms of an element that have the same number of protons but different numbers of neutrons. For example:

a) Atomic number: 6; Element name: Carbon; Element symbol: C

b) Mass number: 12; Element name: Carbon; Element symbol: C

c) Electron configuration: 1s2 2s2 2p2; Element name: Carbon; Element symbol: C

d) Isotope: Carbon-12; Element name: Carbon; Element symbol: C