2. Atoms & Elements

Periodic Table: Classifications

The (truly) Periodic Table

Discussing this chapter, a classmate says, “Since elements 
that form cations are metals and elements that form anions 
are nonmetals, elements that do not form ions are metalloids.” 
Do you agree or disagree?

A historian discovers a nineteenth-century notebook in
which some observations, dated 1822, were recorded on a
substance thought to be a new element. Here are some of the
data recorded in the notebook: “Ductile, silver-white, metallic
looking. Softer than lead. Unaffected by water. Stable in
air. Melting point: 153 °C. Density: 7.3 g>cm3. Electrical conductivity: 20% that of copper. Hardness: About 1% as hard as
iron. When 4.20 g of the unknown is heated in an excess of
oxygen, 5.08 g of a white solid is formed. The solid could be
sublimed by heating to over 800 °C.” (a) Using information
in the text and the CRC Handbook of Chemistry and Physics,
and making allowances for possible variations in numbers
from current values, identify the element reported.

Metalloids posses characteristics of both metals and non-metals.

Periodic Classification of Elements - Introduction | Don't Memorise

At room temperature, a certain element is a colorless, unre-active gas. Is the element likely to be a metal, a nonmetal, or a semimetal?

Element X reacts with element Y to give a product containing X3+ ions and Y2-ions.
(b) Is element Y likely to be a metal or a nonmetal? Explain.

Write the symbol for each element and classify it as a metal,
nonmetal, or metalloid.
a. gold
b. fluorine
c. sodium
d. tin
e. argon

Families of the Periodic Table

At room temperature, a certain element is found to be a soft, silver-colored solid that reacts violently with water and is a good conductor of electricity. Is the element likely to be a metal, a nonmetal, or a semimetal?

Non-metals make up the 2nd largest classification and posses physical properties that are opposite of metals.&nbsp;

At room temperature, a certain element is found to be a shiny, silver-colored solid that is a poor conductor of electricity. When a sample of the element is hit with a hammer, it shatters. Is the element likely to be a metal, a nonmetal, or a semimetal?

Examine Figure 2.3, The periodic table.
(f) Classify the following three elements as metals, nonmet-als, or semimetals: Mo, Br, Si.

Periodic Table Trends

Classify the following elements as metals, nonmetals, or semimetals:
(a) Ti
(b) Te
(c) Se 
(d) Sc
(e) Si

The Periodic Table EXPLAINED | Chemical Families and Periodic Trends

How The Periodic Table Organizes the Elements | Chemistry Basics

Four of the boxes in the following periodic table are colored.
Which of these are metals and which are nonmetals?

Periodic Table of Elements Explained - Metals, Nonmetals, Valence Electrons, Charges

Periodic Table: Classifications Example 1

Where in the periodic table are the metallic elements found? Where are the nonmetallic elements found?<img src="https://lightcat-files.s3.amazonaws.com/problem_images/a84f733d0b5769f2-1668106958786.jpg" alt="" />

Trends in the Periodic Table — Reactivity!

Classify the following elements as metals, nonmetals, or semimetals:
(a) Ar
(b) Sb
(c) Mo 
(d) Cl
(e) N
(f) Mg

What is a semimetal, and where in the periodic table are semimetals found?

Little is known about the properties of astatine, At, because
of its rarity and high radioactivity. Nevertheless, it is possible
for us to make many predictions about its properties. (a) Do
you expect the element to be a gas, liquid, or solid at room
temperature? Explain.

The Periodic Table:3 Major Classifications

Classify these elements as metals, nonmetals, or semimetals.

At room temperature, a certain element is yellow crystalline solid. It does not conduct electricity and when hit with a hammer, it shatters. Is the element likely to be a metal, a nonmetal, or a semimetal?

Learn the Basics of the Periodic Table!

Element X reacts with element Y to give a product containing X3+ ions and Y2-ions.
(a) Is element X likely to be a metal or a nonmetal? Explain.

Metals make up the majority of the elements on the periodic table. Using their physical properties we can describe metals as being shiny, conductive, opaque and malleable.

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1. Intro to General Chemistry

3. Chemical Reactions

4. BONUS: Lab Techniques and Procedures

5. BONUS: Mathematical Operations and Functions

6. Chemical Quantities & Aqueous Reactions

7. Gases

8. Thermochemistry

9. Quantum Mechanics

10. Periodic Properties of the Elements

11. Bonding & Molecular Structure

12. Molecular Shapes & Valence Bond Theory

13. Liquids, Solids & Intermolecular Forces

14. Solutions

15. Chemical Kinetics

16. Chemical Equilibrium

17. Acid and Base Equilibrium

18. Aqueous Equilibrium

19. Chemical Thermodynamics

20. Electrochemistry

21. Nuclear Chemistry

22. Organic Chemistry

23. Chemistry of the Nonmetals

24. Transition Metals and Coordination Compounds

[BOOK CHEM] Clutch Version

Millikan Oil Drop Experiment

The Oil Drop Experiment helped with determining the fundamental charge of the electron.&nbsp;

Ions

Ions represent elements that possess either a positive charge or a negative charge.&nbsp;

Periodic Table: Charges

Elements lose or gain electrons to have the ideal number of outer shell electrons like the noble gases.&nbsp;

Law of Definite Proportions

"Different samples of a pure chemical compound always contain the same proportions of elements by mass."

The Periodic Table contains 3 Major Classifications when describing its elements

Isotopes

Isotopes are atoms of an element that have the same atomic number, but different mass number.&nbsp;

The Atom

The atom represents the basic functional unit in chemistry

Mole Concept

The Mole Concept involves the interconversions between different unit amounts of a substance.

Periodic Table: Representative Elements & Transition Metals

The Groups of the Periodic Table can be broken down into the Representative Elements and Transition Metals

Atomic Theory

John Dalton, one of the "Fathers of Chemistry"is credited with modernizing the Atomic Theory.

Subatomic Particles

The atom is composed of 3 subatomic particles:neutrons, protons, and electrons.

Periodic Table: Elemental Forms

The elements of the Periodic Table exist in different elemental forms in the natural world

Periodic Table: Phases

Under standard conditions of temperature and pressure, the elements can exist as solids, liquids or gases

Atomic Mass

The atomic mass of an element includes the masses of all 3 subatomic particles of neutrons, protons and electrons.&nbsp;

Periodic Table: Group Names

The Periodic Table can be further classified into Periods and Groups.&nbsp;

Law of Conservation of Mass

"In a chemical reaction, no matter is created or destroyed, but instead changes form."

Calculating Molar Mass

Molar Mass is a physical property that represents the mass of a substance divided by the amount of that substance.

Rutherford Gold Foil Experiment

The Gold Foil Experiment helped with the discovery of the positively charged nucleus.

Law of Multiple Proportions

“When 2 elements (A &amp; B) form different compounds, the mass of Element B that combine with 1 g of A are a ratio of whole numbers."

Periodic Table: Element Symbols

The Element Symbols of the Periodic Table represent the abbreviated form of an element