13 atoms of elements in a group of the periodic
table have similar chemical properties.
this similarity is most closely related to the
atoms'
(1) number of principal energy levels
(2) number of valence electrons
(3) atomic numbers
(4) atomic masses

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

To apply in a gold the individual gold atoms are united to each other by means of a metallic bond. how would you use the gold block to determine the atomic radius of a gold atom?