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