Homework Practice

Printable assignment

Final Assessment: Structure of an Atom

Section A: Particles and Atomic Models

Question 1mcq

Atoms are the basic units of:

A.Tissues

B.Organs

C.Elements

D.Mixtures only

Question 2mcq

Electron has charge:

A.Negative

B.No charge

C.Variable only

D.Positive

Question 3mcq

Proton has charge:

A.Always double negative

B.No charge

C.Negative

D.Positive

Question 4mcq

Neutron is found in the:

A.Cell wall

B.Outer shell only

C.Nucleus

D.Electron cloud only

Question 5mcq

Thomson model had electrons embedded in:

A.Fixed shells only

B.Empty space only

C.A positively charged sphere

D.A tiny dense nucleus only

Question 6mcq

Rutherford discovered the atom has a small dense:

A.Vacuole

B.Cell wall

C.Nucleus

D.Tissue

Question 7mcq

Bohr model introduced:

A.No nucleus

B.No electrons

C.Only plum pudding

D.Fixed energy shells

Question 8mcq

K shell capacity is:

A.18

B.8

C.2

D.32

Section B: Electronic Configuration and Valency

Question 9mcq

Configuration of magnesium

(Z=12)

is:

A.2,6,4

B.2,10

C.2,8,2

D.8,4

Question 10mcq

Valency of magnesium

(2,8,2)

is:

A.8

B.6

C.0

D.2

Question 11mcq

Atomic number is represented by:

A.Electrons + neutrons

B.Protons + neutrons

C.Neutrons only

D.Number of protons

Question 12mcq

For

^{23}_{11}Na

, neutrons are:

A.34

B.11

C.12

D.23

Section C: Atomic Number, Mass, Isotopes and Symbols

Question 13mcq

Isotopes of an element have same:

A.Mass number

B.Neutron number

C.Atomic number

D.Physical mass always

Question 14mcq

^{40}Ar

and

^{40}Ca

are:

A.Isobars

B.Isotopes

C.Same element

D.Ions only

Question 15mcq

Symbol of aluminium is:

A.Am

B.Au

C.A

D.Al

Question 16mcq

Symbol of chlorine is:

A.C

B.Cr

C.Ch

D.Cl

Question 17mcq

A labelled Bohr diagram should include:

A.Only mixtures

B.Only tissues

C.Only organelles

D.Nucleus and electron shells

Question 18mcq

A useful atom model activity should correctly show:

A.Only colours without meaning

B.Electrons inside neutrons only

C.No nucleus

D.Protons, neutrons and electrons in suitable positions

Section D: Atom Model Applications

Question 19mcq

Atomic theory evolved because:

A.Evidence is not used in science

B.Only one scientist worked on atoms

C.Models never change

D.New evidence improved earlier models

Question 20mcq

An atom with configuration 2,8,7 is likely:

A.Stable with valency 0

B.Alkali metal only

C.Noble gas

D.Reactive non-metal

Question 21mcq

An atom has mass number 19 and 9 protons. Neutrons are:

A.19

B.28

C.9

D.10

Question 22mcq

Which pair is correctly matched?

A.Sodium — S

B.Nitrogen — Ni

C.Neon — Ne

D.Magnesium — Mn

Question 23mcq

An atom with configuration 2,8,8 has valency:

A.2

B.0

C.1

D.8

Question 24mcq

Most alpha particles passed through gold foil because the atom is mostly:

A.Electron only

B.Water

C.Empty space

D.Solid mass