Evolution Of Atomic Theory

Question 1

Each element is composed of extremely small particles called _______.

Answer 1

atoms

Question 2

Radioactivity was observed by _______.

Answer 2

Henri Bacquerel

Question 3

Who discovered the three types of radiation?

Answer 3

Ernest Rutherford

Question 4

The prevailing theory was that of the _______ model, put forward by ________.

Answer 4

“plum pudding”
Thompson

Question 5

The heaviest known atom has a mass of approximately _________.

Answer 5

4×10^-22g

Question 6

1 amu

Answer 6

1.66054 × 10^-24g

Question 7

Atoms of an element with the same number of protons, but a different number of neutrons.

Answer 7

Isotope

Question 8

Exercise 1: How many protons, neutrons and electrons are in an atom of (a) ¹⁹⁷Au, (b) Strontium 90?

Answer 8

p+. e- n
¹⁹⁷Au. 79. 79. 118

⁹⁰Sr 38. 38. 52

Question 9

When an atom of a group of atoms loses or gains electrons, it becomes an _____.

Answer 9

ion

Question 10

______ are formed when at least one electron is lost.

Answer 10

Cations

Question 11

______ are formed when at least one electron is gained.

Answer 11

Anions

Question 12

It is the arrangement of electrons in atoms.

Answer 12

Electronic Structure

Question 13

The light we see with our eyes.

Answer 13

Visible light

Question 14

Electromagnetic radiation carries energy through space, it is also known as _______.

Answer 14

radiant energy

Question 15

Distance between two adjacent peaks or troughs.

Answer 15

Wavelength

Question 16

It is the number of complete wavelengths or cycles that pass a given point each second.

Answer 16

Frequency

Question 17

It is a display of various types of electromagnetic radiation arranged in order of increasing wavelength.

Answer 17

Electromagnetic Spectrum

Question 18

It is called energy packets.

Answer 18

Quanta(singular:quantum)