Periodic Table of Elements; Properties
Based on chemical formula, differentiate elements and compounds
An element has a certain number of electrons and a nucleus to form an atom. The chemical formula of a compound shows the number of and what different atoms an element has. A compound contains several elements.
What are the elements for H, O, Na, Cl, H2O, NaCl, CO2?
H=hydrogen O=oxygen Na=sodium Cl=chloride H2O=water NaCl=sodium chloride CO2=carbon dioxide
Differentiate chemical and physical properties
Physical properties are things that can be observed or measured without changing it. Chemical properties may only be observed by changing the chemical identity of a substance.
Where are the protons, neutrons, and electrons located?
Protons and neutrons are inside the atom near the nucleus, while the electrons circle around and orbit the protons and neutrons
What are indicators of physical change?
Size, color, volume, shape, density
What is the major difference between different elements?
atomic number; number of protons
All living and nonliving things can be broken down to a set of known ____________
elements
Which element has most similar properties with Strontium?
magnesium
What are indicators of chemical change?
odor, solubility, energy given off or absorbed, magnetism
Elements are rarely found in their ____ nature
pure