## Time to learn!!!!!SONYA GASPAR 3/2/17

### PERIODIC TABLE

Where are Metals, Nonmetals and Metalloids on the periodic table

### Protons, Electrons, and Neutrons

What are they and what are their charges ?

#### Protons

• A proton has positive charge of 1, that is, equal but opposite to the charge of an electron. A neutron, like the name implies, is neutral with no net charge. The charge is believed to be from the charge of the quarks that make up the nucleons

#### Electrons

• Electrons are the negatively charged particles of atom. Together, all of the electrons of an atom create a negative charge that balances the positive charge of the protons in the atomic nucleus.

#### Neutrons

• Protons and neutrons are in the center of the atom.Proton—positive; electron—negative; neutron—no charge. The charge on the proton and electron are exactly the same size but opposite. The same number of protons and electrons exactly cancel one another in a neutral atom.

Dmitri Mendeleev

### Reactivity of the elements on the periodic table?

As you move from left to right in the period, we see that the reactivity increases. On the other hand, as you move down a group in the nonmetals, the reactivity decreases. The farther right and up you go on the periodic table, the higher the electronegativity, resulting in a more vigorous exchange of electrons.

### GROUP NAMES

Group 1: alkali metals.

Group 2: alkaline earth metals.

Group 11: coinage metals

Group 15: pnictogens

Group 16: chalcogens.

Group 17: halogens.

Group 18: noble gases.

### Atomic Number

What information does each number tell?

It shows us the number of protons ,the symbol and also the reactive atomic mass

ATOMIC NUMBER = # of Protons

ATOMIC MASS=#of Atoms

How do you know the number of electrons?