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Question 1

It is the scientific theory that matter is composed of particles called atoms.

Answer 1

Atomic Theory

Question 2

Evolution of Atomic Theory

Answer 2

ATOMISM (DEMOCRITUS, 5TH CENTURY BC), SOLID SPHERE MODEL (JOHN DALTON, 1803), PLUM PUDDING MODEL (J.J. THOMSON, 1897), NUCLEAR MODEL (ERNEST RUTHERFORD, 1911), PLANETARY MODEL (NIELS BOHR, 1913), QUANTUM MODEL (ERWIN SCHRODINGER, 1926)

Question 3

Atoms are invisible, and compounds are combinations of different types of atoms.

Answer 3

SOLID SPHERE MODEL (JOHN DALTON, 1803)

Question 4

The atom is a sphere, but the positive and negative charges are embedded within it.

Answer 4

PLUM PUDDING MODEL (J.J. THOMSON, 1897)

Question 5

Electrons orbiting in a set, predictable paths around fixed, positively nucleus.

Answer 5

NUCLEAR MODEL (ERNEST RUTHERFORD, 1911)

Question 6

Electrons are arranged in concentric specific circular orbits around the nucleus.

Answer 6

PLANETARY MODEL (NIELS BOHR, 1913)

Question 7

The locations of the electrons could only be described as being part of a ‘cloud’ around the nucleus.

Answer 7

QUANTUM MODEL (ERWIN SCHRODINGER, 1926)

Question 8

In 1803, _________, developed the first atomic theory and introduced the use of symbols to represent the elements. These elements can combine to form compounds.

Answer 8

John Dalton

Question 9

Postulate 1 of Dalton’s Atomic Theory

Answer 9

Elements consist of indivisible small particles, called atom.

Question 10

Postulate 2 of Dalton’s Atomic Theory

Answer 10

All atoms of the same element are identical; different elements have different types of atoms.

Question 11

Postulate 3 of Dalton’s Atomic Theory

Answer 11

Atoms can neither be created nor destroyed.

Question 12

Postulate 4 of Dalton’s Atomic Theory

Answer 12

‘Compound elements; (i.e. compounds) are formed when atoms of different elements join in simple ratios to form ‘compound atoms’ (i.e. molecules)

Question 13

Serves as the identity of an atom. Also refers to the number of protons in the nucleus of each atom of an element.

Answer 13

Atomic Number

Question 14

_______is the total number of neutrons and protons present in the nucleus of an atom of an element.

Answer 14

Atomic Mass

Question 15

Atoms that have the same atomic number but different masses are known as ________.

Answer 15

Isotopes

Question 16

Charges atoms have are generally called

Answer 16

Ions

Question 17

Positively charged ion

Answer 17

Cation

Question 18

negatively charged ion

Answer 18

Anion

Question 19

In 1913, ________ improved Rutherford’s model by adding the concept of orbits

Answer 19

Niels Bohr

Question 20

______are stable discrete regions where electrons do not experience spontaneous energy absorption and emission.

Answer 20

Orbits

Question 21

Orbits are also known as

Answer 21

Energy level (n)

Question 22

Mathematical description of the wave properties of electrons and other small particles.

Answer 22

QUANTUM THEORY

Question 23

It suggests the probability of finding an electron at give place around the nucleus.

Answer 23

QUANTUM THEORY

Question 24

An _______is a three-dimensional region surrounding the nucleus and represents the probable location of the electrons.

Answer 24

Orbital

Question 25

Orbital: Orbit:

Answer 25

Probable location of electrons Path of a revolving object

Question 26

In the__________________, an electron orbiting the nucleus will have a unique set of four quantum numbers.

Answer 26

quantum mechanical model

Question 27

____________describe the atomic orbitals as well as the properties of the electrons in those orbitals.

Answer 27

Quantum numbers

Question 28

It refers to the distance of electron from the nucleus

Answer 28

PRINCIPAL QUANTUM NUMBER (n)

Question 29

It is also known as the shell

Answer 29

PRINCIPAL QUANTUM NUMBER (n)

Question 30

It describes the shape of the atomic orbital

Answer 30

AZIMUTHAL QUANTUM NUMBER

Question 31

It is also known as the subshell or orbital angular movement quantum number

Answer 31

AZIMUTHAL QUANTUM NUMBER

Question 32

Is simple a description of how electrons are distributed in an atom. It follows the spdf notation.

Answer 32

Electron Configuration

Question 33

On the hand, hand consists of boxes are arrow that present the orbitals and the electrons. The up and down orientations of the arrows represent the two spins of electrons.

Answer 33

Orbital Diagram

Question 34

Dictates the manner in which electrons are filled in the orbitals of an atom in its ground state.

Answer 34

Aufbau Principle

Question 35

* On the electrons can occupy the same, * The two electrons that are present in the game must have opposite spins or they should be anti-parallel

Answer 35

Paulis Exclusion Principle

Question 36

* Every orbital in a sublevel is singly occupied before any orbital is double occupied. * All of the electrons in singly occupied orbitals have the same spin (to maximize total spin.)

Answer 36

Hund Rule

Question 37

It is method to represent valence electrons of elements.

Answer 37

Lewis Electron-Dot Symbol

Question 38

______are shown as dots around the element symbol

Answer 38

Valence electrons

Question 39

The tendency of an element to gain, lose, or share electrons to attain eight electrons in its valence shell during chemical bonding is called______

Answer 39

Octet Rule

Question 40

Elements in the same group have the same number of ___________.

Answer 40

valence electrons

Question 41

The modern numbering system of "group 1" to "group 18" has been recommended by the

Answer 41

International Union of Pure and Applied Chemistry
(IUPAC) since 1988.

Question 42

______results from the transfer of one or more valence electrons from one atom to another.

Answer 42

Ionic bond

Question 43

If sharing of an electron pair between atom exists.

Answer 43

Covalent bond

Question 44

The case is different among metals, where there are highly mobile valence electrons in the atoms that make up the metals Bonds holding metal atoms together are called

Answer 44

Metallic Bond