Atomic Structure & Periodic Table Info

Question 1

The average mass of all the isotopes for a given atom is called ___________.

Accepted Answer

average atomic mass

Question 2

When an atom of 20 atomic mass units loses an electron, the atom's mass:

Accepted Answer

remains constant

Question 3

To become a negative ion, an atom must ____________.

Accepted Answer

gain electrons

Question 4

Which of the following isotopes of zinc is the lightest?

Accepted Answer

zinc-64

Question 5

Group 1 elements are also called ____________.

Accepted Answer

alkali metals

Question 6

An atom that has 2 more protons than electrons has a charge of:

Accepted Answer

+2

Question 7

How many protons are in the neutral atom shown below?

Accepted Answer

12

Question 8

The particles with NO charge in an atom are the :

Accepted Answer

neutrons

Question 9

An atom, as shown on the periodic table, is neutral because it contains equal numbers of

Accepted Answer

protons and electrons

Question 10

Elements that have chemical and physical properities of both metals and nonmetals are _____.

Accepted Answer

metalloids

Question 11

Which listing below shows the proper charges of the subatomic particles?

Accepted Answer

p = +1 n = 0 e = -1

Question 12

Which subatomic particles are located inside the nucelus of an atom?

Accepted Answer

protons & neutrons

Question 13

A column on the periodic table can also be called a ________ or a ___________.

Accepted Answer

group / family

Question 14

If an elements has an atomic number of 7 and an atomic mass of 14, there must be:

Accepted Answer

7 protons and 7 neutrons in the nucleus of the element

Question 15

Why do atoms have an overall charge of zero?

Accepted Answer

The number of protons equals the number of electrons.

Question 16

The sum of the number of protons and neutrons inside the nucleus is called the __________.

Accepted Answer

mass number

Question 17

Oxygen's atomic number is 8. This means that an oxygen atom must always have:

Accepted Answer

8 protons

Question 18

To become a positive ion, an atom must ___________ .

Accepted Answer

lose electrons

Question 19

Where is most of the mass in an atom located?

Accepted Answer

In the nucleus.

Question 20

What characteristics of an atom is determined by the number of electrons?

Accepted Answer

reactivity

Question 21

The modern periodic table, which is based on atomic number, was developed by ________.

Accepted Answer

Moseley

Question 22

Carbon-13 and Carbon-14 are examples of _______________ for the carbon element.

Accepted Answer

isotopes

Question 23

Elements in group 17 are called ____________.

Accepted Answer

halogens

Question 24

Elements in groups 3 - 12 are called ___________.

Accepted Answer

transition metals

Question 25

Who organized the first periodic table based the elements' atomic masses?

Accepted Answer

Mendeleev

Question 26

A row on the periodic table is also called a ________.

Accepted Answer

period

Question 27

What is true of an atom consisting of 2 protons, 2 electrons and 2 neutrons?

Accepted Answer

All of these are true.

Question 28

One isotope of oxygen differs from another isotope of oxygen in:

Accepted Answer

mass

Question 29

What characteristics of an atom is determined by the number of protons?

Accepted Answer

identity

Question 30

Elements on the modern periodic table are arranged according to their _________.

Accepted Answer

atomic numbers

Question 31

The particles which have equal but opposite electrical charges are:

Accepted Answer

protons and electrons

Question 32

An atom like sodium can become a positively charged ion. How does this happen?

Accepted Answer

it loses electrons

Question 33

Valence electrons are located _________.

Accepted Answer

in the outer orbital shell

Question 34

Carbon-14 is an isotope of carbon (atomic number 6). How many neutrons are in this atom?

Accepted Answer

8

Question 35

Atoms of the same element that have a different number of neutrons are called ____________.

Accepted Answer

isotopes

Question 36

The number of protons an atom contains is identified by the ____ ____ on the periodic table.

Accepted Answer

atomic #

Atomic Structure & Periodic Table Info

Questions 36

Atomic Structure & Periodic Table Info

Questions 36