Atomic Radius

Atomic Radius

9th - 12th Grade

26 Qs

quiz-placeholder

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Atomic Radius

Atomic Radius

Assessment

Quiz

Chemistry

9th - 12th Grade

Medium

Created by

Jon Geiger

Used 9+ times

FREE Resource

26 questions

Show all answers

1.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

A neutral atom must have the same number of _______ and _______.

protons

neutrons

electrons

Answer explanation

The net charge of an atom is # protons - # electrons. When protons = electrons, the net charge is zero.

2.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

What is the charge of an atom's nucleus?

positive

negative

neutral

none of these

Answer explanation

The nucleus has protons (+) and neutrons (0), so they add to be positive!

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What law describes the force relationship between protons in the nucleus and the electrons orbiting around the nucleus?

Ideal Gas Law

Combined Gas Law

Coulomb's Law

Biot-Savart Law

Answer explanation

Coulomb's Law states that the force between two charged particles is proportional to both of their charges, and inversely proportional to the distance between them.

4.

DROPDOWN QUESTION

1 min • 1 pt

Coulombic Attraction is the ​ (a)   between two ​ (b)   charges, often used to describe the interaction between ​ (c)   in an atom.

force
opposite
protons and electrons
energy
like
protons and neutrons

Answer explanation

Like charges repel, and opposite charges attract! Coulombic attraction refers to the latter.

5.

DROPDOWN QUESTION

1 min • 1 pt

Adding a proton to an atom ​ (a)   coulombic attraction between protons and electrons, which causes the electrons to be ​ (b)  

increases
pulled closer toward the nucleus
decreases
pushed further away from the nucleus

6.

DROPDOWN QUESTION

1 min • 1 pt

Increasing the number of protons in an atom within a row ​ (a)   the atomic number​ and (b)   the radius of the atom.

increases
decreases
does not affect

Answer explanation

Adding more protons causes coulombic attraction to increase and pulls the electrons closer, decreasing the radius of the atom.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why does an atom's radius increase when entering a new period (row)?

Examples: He -> Li, Ne -> Na, Ar -> K

A new electron shell is formed

More protons are added to the atom

More neutrons are added to the atom

The increased number of electrons increases repulsion forces

Answer explanation

Media Image

Electrons are stored in shells or energy levels! Entering a new period requires a new shell to be added, drastically increasing the atomic radius.

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