Answer:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups.
Each row represents one period; the period number of an element indicates how many of its energy levels house electrons. Sodium, for instance, sits in the third period, which means a sodium atom typically has electrons in the first three energy levels.
Explanation:
Answer:
Explanation:
= Density of acetic acid = 
= Mass of acetic acid = 
= Volume
Density is given by
The volume of acetic acid is .
<em><u>Dinitrogen Tetraoxide</u></em>
Formula: N₂O₄
Molar mass: 92.011 g/mol
the inner core is the answer
Hydrogen is the first element in the periodic table and only has one proton, one neutron, and one electron. The charge is zero but there are two charged particles.
