Atoms and the Periodic Table Clicker Review Take the clicker that matches your number on the list (see first lab table)!

An atom is electrically neutral because protons & electrons have opposite charges. the charge of protons is balanced by the charge of neutrons. the number of protons is equals the number of electrons. Both a and c.

The electrons are found in shells or energy levels. electron clouds. with the neutrons in the nucleus. both A & B.

The nucleus of the atom contains only neutrons. most of the mass of the atom. electrons and protons. electrons and neutrons.

The order of elements in the periodic table is based on the number of protons. the number of electrons. the number of neutrons. the average atomic mass.

All elements in the same group have the same number of _____ and all elements in the same period have the same _____. number of shells; oxidation number. valence electrons; oxidation number. valence electrons; number of shells. shells; number of valence electrons.

Carbon and other nonmetals are found in which area of the periodic table? on the left side on the right side in the middle column of the periodic table in the bottom rows

What is the charge of an electron? Negative Positive Neutral

Where are the electrons with the most energy? Closest to the nucleus Furthest from the nucleus In the middle shells They all have the same energy no matter where they are located.

The order of the periodic table is based on the number of protons number of neutrons atomic mass charge of the nucleus

Atoms of elements that are in the same group have the same number of protons neutrons valence electrons mass

Valence electrons tell us an atom’s mass reactivity charge period

Which of the following elements is an alkali metal? Calcium - Ca Magnesium - Mg Mercury - Hg Sodium - Na

Why are alkali metals so quick to react? They have small masses. They are soft solids at room temperature. They give away their 1 valence electron so their next shell has 8. They aren’t quick to react.

When Chlorine (Cl) reacts, it steals an electron When Chlorine (Cl) reacts, it steals an electron. What does this do to the atom? Cl +1 Cl -1 Cl +8 Cl 0

Noble gases don’t react because they become positive in the air. they become negative in the air. their outer shells are already full. they are gases.

What is the family of Iron (Fe) Alkali metals Alkaline Earth metals Rare-earth metals Transitional metals

What is the family of Chlorine (Cl)? Halogen family Oxygen family Transitional Metals Noble gases

What is the family of Calcium (Ca)? Transitional metals Alkali metals Alkaline earth metals Rare-earth metals

Is Silicon (Si) a metal, nonmetal, or metalloid? None of the above

What is the family of Phosphorus (P)? Noble gases Halogens Nitrogen family Carbon family

What is the family of Hydrogen (H)? Alkali metals Noble gases Rare-earth Not in a family

What is the most reactive metal? Fluorine (F) Francium (Fr) Lithium (Li) Uranium (U)

What is the magic number in chemistry? Why?

With a partner, match what each scientist or theory believed about atoms. 1.Democritus (Greek) A. Atoms of same element are 2.Dalton alike 3.Thompson B. electrons orbit like planets 4.Rutherford C. there must be a nucleus 5.Bohr D. 1st to name electrons 6.Modern Theory E. electrons in clouds; can’t locate F. first to name atoms, but thought indivisible

Drawing Atoms 1. Symbol 9. Group? 2. atomic number 10. Family? 3. mass number 11. Solid, liquid, or gas? 4. # protons 12. Metal, nonmetal, or metalloid? 5. # electrons 13. Which element would it react with? 6. # neutrons 14. Why would it react with that element? 7. # shells (clouds) 15. Draw an atom of the element. 8. # valence electrons