S3 Second Term Atom Revision Quiz

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Questions and Answers

What is the likely ionic charge of an oxygen atom when it forms an ion?

O+

O-

O2+

O2- (correct)

Which of the following shows the correct electronic configuration for Carbon (C)?

2, 4 (correct)

2, 2

2, 8, 2

2, 6

Which chemical formula represents the ionic compound formed between Copper (Cu) and Oxygen (O)?

Cu3O2

CuO2

CuO (correct)

Cu2O

What is the correct formula for the ionic compound formed by Magnesium ions (Mg2+) and Chloride ions (Cl-)?

MgCl2 Signup and view all the answers

Which statement about noble gases is true based on their electronic arrangement?

They have a full outer shell of electrons. Signup and view all the answers

How many single bonds are present in the molecular structure of CH4?

4 single bonds Signup and view all the answers

What is the type of bonds present in O2?

1 double bond Signup and view all the answers

How many bonds are present in PCl3?

3 single bonds Signup and view all the answers

What type of bonds are found in the molecular structure of NOCl?

1 single bond and 1 double bond Signup and view all the answers

What is the number of single bonds in H2O2?

3 single bonds Signup and view all the answers

What is the total number of bonds in the molecule represented by F2?

1 single bond Signup and view all the answers

How many total bonds are present when looking at the structure Cl-O-H?

2 single bonds Signup and view all the answers

Which of the following describes the bonding in the molecule O-C-O?

1 double bond and 1 single bond Signup and view all the answers

What term best describes a substance composed of two or more elements chemically bonded together?

Compound Signup and view all the answers

Which of the following methods is used to extract argon from its natural source?

Fractional distillation of liquid air Signup and view all the answers

How many atoms are present in a single molecule of H2O2?

4 atoms Signup and view all the answers

What natural source provides the majority of chlorine in the environment?

Ocean water Signup and view all the answers

Which chemical method would effectively distinguish between KCl and CaCl2?

Flame test Signup and view all the answers

What is the common name of the compound CaO?

Lime Signup and view all the answers

Which molecule contains a total of 6 atoms and 3 different kinds of atoms?

KMnO4 Signup and view all the answers

What is the most abundant compound found in sea water?

Water Signup and view all the answers

What is the electronic arrangement of a potassium atom (K)?

2, 8, 8, 1 Signup and view all the answers

To which group and period does the electronic arrangement 2, 8, 2 belong?

Group II, Period 3 Signup and view all the answers

What is the group and period information for an atom with an electronic arrangement of 2, 5?

Group V, Period 2 Signup and view all the answers

Which of the following statements about the physical appearance of chlorine is correct?

Chlorine is a yellowish green gas. Signup and view all the answers

What is the electronic arrangement of a chloride ion (Cl-)?

2, 8, 8 Signup and view all the answers

Is silicon considered a metal, non-metal, or semi-metal?

Semi-metal Signup and view all the answers

What is the group classification of the element that has the same group as lithium in Period 3?

Group I Signup and view all the answers

What characterizes a stable chloride ion (Cl-)?

It has a noble gas electronic arrangement. Signup and view all the answers

What is the mass number of an element if it has 12 protons and 13 neutrons?

25 Signup and view all the answers

Which electronic structure indicates an unstable element?

2, 6 Signup and view all the answers

What is the maximum number of electrons that can be held in the third electron shell?

18 Signup and view all the answers

Which ion would be expected to have a noble gas electronic arrangement like Neon?

O2- Signup and view all the answers

Which of the following is a characteristic of Group VII elements?

Their color deepens as you move down the group. Signup and view all the answers

What is the charge of the ionic compound formed by Na and Cl?

NaCl has no charge. Signup and view all the answers

The electronic configuration of Sodium (Na) is represented as what?

2, 8, 1 Signup and view all the answers

What does the symbol 'X' represent in the AXZ notation?

Chemical symbol Signup and view all the answers

Which compound corresponds with the flame color of bright red?

Calcium (Ca) Signup and view all the answers

What type of chemical bond is represented by H-N≡N?

Triple bond Signup and view all the answers

What is the main composition of air?

78% Nitrogen, 21% Oxygen Signup and view all the answers

What defines a compound in chemistry?

Made up of more than one kind of atom chemically bonded. Signup and view all the answers

How can you classify sea water in terms of matter?

Mixture Signup and view all the answers

What generally happens to the colors of group 0 elements as you move down the group?

They remain colorless. Signup and view all the answers

Study Notes

Important Atom Values

Mass number (A) = Number of protons + Number of neutrons
Atomic number (Z) = Number of protons
AXZ notation illustrates atomic structure: A (mass number), Z (atomic number), X (chemical symbol).

Electron Shells and Structure

Maximum electrons in nth shell = 2n².
Electronic structures of the first 20 elements outlined, e.g.:
- H: 1, He: 2, Li: 2, 1, Na: 2, 8, 1.
Noble gas arrangement signifies stability, e.g.:
- O atom (2, 6) vs. O2- ion (2, 8) showing stability post electron gain.

Periodic Table Insights

Arranged by atomic number, reflecting electronic arrangements.
Periods indicate the same occupied electron shell; groups indicate the number of outermost electrons.
Group VII elements are colored substances; color deepens down the group.
Group 0 elements are colorless gases.

General Classifications

Elements categorized as metals, non-metals, and semi-metals.
Unstable elements lack noble gas electronic arrangements.

Ionic and Covalent Bonds

Ionic compounds require balanced charges between cations and anions.
Example ionic formulas:
- NaCl, MgCl2, CuO.
Covalent bonds represented through line notation showing single, double, and triple bonds.

Composition of Air

Composed of 78% Nitrogen (N2), 21% Oxygen (O2), 0.93% Argon (Ar), and 0.04% Carbon dioxide (CO2).
Fractional distillation is used for isolating components of liquid air.

Sea Water and Electrolysis

Sea water is a mixture of elements and compounds.
Electrolysis of sea water produces disinfectants and gases; e.g., NaCl yields Na+ and Cl2.

Flame Test

Distinct flame colors for various compounds, e.g.:
- Sodium: golden yellow, Potassium: lilac, Copper: bluish green, Calcium: brick red.
Utilizes non-luminous flame and concentrated HCl for wire cleansing.

Natural Sources and Extraction

Natural sources for argon, oxygen, and nitrogen include liquid air; sodium hydroxide and hydrogen come from sea water.
Most abundant substance and salt in sea water is water (H2O) and sodium chloride (NaCl) respectively.

Properties and Stability

Physical appearances of elements under room conditions:
- Chlorine: yellowish-green gas, Argon: colorless gas, Fluorine: pale yellow gas.
Elements with stable electronic arrangements conform to noble gas configurations.

Practice Questions Overview

Questions test knowledge of electronic arrangements, classification of elements, physical appearances, and methods of distinguishing compounds through tests.
Examples of questions cover periods and groups in the periodic table, ion formation, and chemical formulas for ionic compounds.

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Description

This quiz covers important concepts about atomic structure, including mass number and atomic number. It will help reinforce the AXZ notation and the relationship between protons and neutrons. Get ready to test your knowledge and understanding of the fundamental principles of chemistry.