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.Organs

B.Elements

C.Tissues

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.Outer shell only

B.Electron cloud only

C.Nucleus

D.Cell wall

Question 5mcq

Thomson model had electrons embedded in:

A.Fixed shells only

B.A positively charged sphere

C.A tiny dense nucleus only

D.Empty space only

Question 6mcq

Rutherford discovered the atom has a small dense:

A.Nucleus

B.Vacuole

C.Cell wall

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.32

B.18

C.2

D.8

Section B: Electronic Configuration and Valency

Question 9mcq

Configuration of magnesium

(Z=12)

is:

A.8,4

B.2,8,2

C.2,10

D.2,6,4

Question 10mcq

Valency of magnesium

(2,8,2)

is:

A.2

B.8

C.6

D.0

Question 11mcq

Atomic number is represented by:

A.Protons + neutrons

B.Electrons + neutrons

C.Neutrons only

D.Number of protons

Question 12mcq

For

^{23}_{11}Na

, neutrons are:

A.23

B.34

C.12

D.11

Section C: Atomic Number, Mass, Isotopes and Symbols

Question 13mcq

Isotopes of an element have same:

A.Neutron number

B.Atomic number

C.Physical mass always

D.Mass number

Question 14mcq

^{40}Ar

and

^{40}Ca

are:

A.Isobars

B.Isotopes

C.Ions only

D.Same element

Question 15mcq

Symbol of aluminium is:

A.Au

B.A

C.Am

D.Al

Question 16mcq

Symbol of chlorine is:

A.Ch

B.Cr

C.Cl

D.C

Question 17mcq

A labelled Bohr diagram should include:

A.Only organelles

B.Nucleus and electron shells

C.Only mixtures

D.Only tissues

Question 18mcq

A useful atom model activity should correctly show:

A.Protons, neutrons and electrons in suitable positions

B.Only colours without meaning

C.No nucleus

D.Electrons inside neutrons only

Section D: Atom Model Applications

Question 19mcq

Atomic theory evolved because:

A.Models never change

B.Evidence is not used in science

C.Only one scientist worked on atoms

D.New evidence improved earlier models

Question 20mcq

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

A.Noble gas

B.Alkali metal only

C.Reactive non-metal

D.Stable with valency 0

Question 21mcq

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

A.9

B.10

C.19

D.28

Question 22mcq

Which matched pair is correct for chemical symbols?

A.Neon — Ne

B.Magnesium — Mn

C.Sodium — S

D.Nitrogen — Ni

Question 23mcq

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

A.8

B.2

C.1

D.0

Question 24mcq

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

A.Electron only

B.Solid mass

C.Empty space

D.Water