8.5 A, B, & C Unit Test Review

8.5 A, B, & C Unit Test Review

TEKS 8.5 A

• Describe the structure of atoms, including the masses, electrical charges, and locations of protons and neutrons in the nucleus and electrons in the electron cloud. 

Atomic Structure

• Atomic # = The # of Protons = the # of electrons
• (APE)
• Atomic Mass - Atomic Number = the # of Neutrons
• (Man)
• Atoms are identified on the periodic table by the number of protons that they have

• Protons are Positive - Found in the Nucleus

• Neutrons have no charge - Found in the Nucleus

• Electrons are Negative - found on the energy levels (Shells) surrounding the nucleus

Multiple Choice

What element is it? Contains a mass of 64 and it has 35 Neutrons.

• Gadolinium (Gd)

• Copper (Cu)

• Zinc (Zn)

• Bromine (Br)

Multiple Select

Select all that describe electrons?

• positive charge

• negative charge

• no charge

• found inside the nucleus

• found outside the nucleus

Multiple Select

Select all that describe neutrons?

• positive charge

• negative charge

• no charge

• found inside the nucleus

• found outside the nucleus

Multiple Select

Select all that describe protons?

• positive charge

• negative charge

• no charge

• found inside the nucleus

• found outside the nucleus

Multiple Choice

An atom of a certain element has a mass of 48, it has 22 protons and 22 electrons. How many neutrons are in this atom?

• 26

• 48

• 22

• 70

TEKS 8.5 B 

• Identify that protons determine an element's identity and valence electrons determine its chemical properties, including reactivity

• Valence Electrons are located on the outer shell (Energy level)

• Valence electrons are used to determine the elements reactivity

• Valence electrons found in the groups / columns on a periodic table.

Multiple Choice

Elements in group one are with a valence electron of one are __.

• very reactive

• not very reactive ( stable )

Multiple Select

Select all that apply to valence electrons___.

• They found on the horizontal periods on a periodic table.

• They are found on the vertical groups on a periodic table.

• They represent the number of energy shells

• They represent the chemical reactivity of an element.

• They are located on the outside energy shells.

Multiple Choice

Which statement accurately describes atoms of Phosphorus?

• Phosphorus atoms have 31 Protons

• Phosphorus atoms have 5 valence electrons

• Phosphorus atoms have 31 electrons

• Phosphorus atoms 15 neutrons.

TEKS 8.5 C

• Interpret the arrangement of the Periodic Table, including groups and periods, to explain how properties are used to classify elements. 

Periods = Rows = Horizontal

• Periods are found on the horizontal rows on a periodic table.

• Periods represent the number of energy levels (Shells) in an atom

• There are 7 periods

Groups = Columns = Vertical

• Groups are the vertical columns on a periodic table

• Valence electrons are located on the outermost shell

• Valence electrons follow the 2 - 8 - 8 rule in Bohr models

• Elements in the same groups have the same number of valence electrons on their outside shell

• Elements in the same groups have similar chemical reactivity

Multiple Choice

A researcher wants to experiment with an element that reacts like Calcium (Ca) but has a greater atomic mass. Which element should the researcher select for the experiment?

• Barium (Ba)

• Titanium (Ti)

• Beryllium (Be)

Multiple Choice

How many valence electrons does this atom have?

• Has 2 Valence Electrons

• Has 4 valence electrons

Multiple Select

Select the elements that have 7 valence electrons

• F

• Br

• Fr

• Db

• N

Multiple Select

Select the elements that are metalloids

• Calcium

• Boron

• Aluminum

• Polonium

• Arsenic

Multiple Select

Select the elements that are non metals

• Helium

• Antimony

• Zinc

• Hydrogen

• Chlorine

Metals, Nonmetals, Metalloids

• compare metals, nonmetals, and metalloids using physical properties such as luster, conductivity, or malleability

• Metals are described as - solids at room temperature, malleable, conduct electricity and heat, can be ductile, have luster (shiny), are found mostly on the left side of the periodic table

• Non -Metals - do not conduct electricity or heat, are dull or lack luster, mostly gases, are found on the right side of the periodic table

• Metalloids - Have characteristics of both metals and non metals, are found along the zig zag, are often used in computers, can have luster or can lack luster

Multiple Select

Select the elements that are metals

• Iodine

• Erbium

• Lead

• Polonium

• Hydrogen