Pre Test Atomic Structure

What is the chemical symbol for calcium?

• Cl

• C

• Ca

• Cu

• Cr

How many protons are in nickel?

• 3

• 8

• 31

• 28

• 24

Which element has a mass of 65?

Electrons are found

• Inside nucleus

• Outside nucleus

• With protons

• With neutrons

The atom oxygen has a neucleon number of 16 and a proton number of 8. what is the number of neutrons in the oxygen atom?

• 4

• 16

• 8

• 0

Carbon-12 and Carbon-14 are _______________.

• Ions

• Isotopes

• Different elements

• Compounds

Mass number refers to:

• The number of protons in the nucleus of an atom.

• The number of electrons in an atom.

• The number of neutrons in an atom.

• The total number of protons and neutrons in the nucleus of an atom.

How many electrons does Californium have?

• 96

• 92

• 97

• 98

• 99

What is Californium's atomic number?

• 96

• 97

• 98

• 99

• 100

What is the formula for calculating the number of neutrons in an element?

• Atomic mass - atomic number

• Atomic number - atomic mass

• Atomic weight - atomic mass

• Atomic mass - atomic weight

• # of protons - # of electrons

An element, X, has the following electron configuration:    2,  5The atomic number of element X would be:

• 2

• 5

• 7

• 3

“Isotopes are elements that have the same number of neutrons and different number of protons.” What is wrong with the previous sentence?

• Isotopes are elements that have the same number of protons and different number of neutrons.

• Isotopes are elements that have the same number of protons and different number of electrons.

• Isotopes are elements that have the same number of neutrons and different number of electrons.

• Isotopes are elements that have the same number of electrons and different number of protons.

Element X has a nucleon number of 40 and a proton number of 20. Which period in the periodic table is X found in?

• Period 4

• Period 1

• Period 7

• Period 5

What type of element is Potassium?

• Metal

• Non-metal

• Metalloid

• Noble Gas

• Halogen

How many protons does Californium have?

• 96

• 97

• 99

• 98

• 100

Which of the following statements regarding atomic particles is false?

• Protons are found in the nucleus and are positively charged particles

• Electrons move around the nucleus and contribute little to the mass of the atom

• Neutrons are found in the nucleus and they have no charge

• The numbers of neutrons, protons and electrons are always equal in a neutral atom

Hydrogen, deuterium and tritium are all isotopes of hydrogen. They have a different number of _____________.

• Atoms

• Neutrons

• Protons

• Electrons

The electron configuration:  2, 8, 4 is that of:

• Carbon

• Nitrogen

• Neon

• Silicon

What is the atomic mass of phosphorus?

• 15

• 31

• 2

• 18

• 16

How many neutrons does Be have?

• 4

• 5

• 6

• 7

• 9

How many netrons does Californium have?

• 110

• 153

• 98

• 251

• 1

Element P has a nucleon number of 31 and a proton number of 15. Eement S has a nucleon number of 32 and a proton number of 16. The two elements have the same __________.

• Number of protons

• Number of neutrons

• Nucleon number

• Number of electrons

Calculate the number of protons, neutron, and electrons in an atom of Beryllium which has an atomic number of 4 and an atomic mass of 9.

• 4, 4, 4

• 4, 5, 5

• 4, 5, 13

• 4, 5, 4

The number of valence electrons in an atom is equal to

• The number of electrons in the atom.

• The charge on a positive or negative ion formed by that atom.

• The number of electrons in the outer energy level of the atom.

• The number of electrons needed to fill all the energy levels of the atom.

An atom has very little empty space.

• True

• False

The electron configuration for Al³⁺ is

• 2, 8, 3

• 2, 8

• 2, 8, 6

• 2, 8, 2

The element chlorine has an electron configuration of 2,8,7. It is in which group and period ?

• Group 7 and period 3

• Group 17 and period 4

• Group 3 and period 17

• Group 3 and period 7

Which group contains elements that are chemically stable?

• 1

• 2

• 8

• 12

The Lewis Dot diagram for Carbon would have how many dots (valence electrons)?

• 2

• 3

• 4

• 5

• 6

What is Californium's atomic mass?

• 247

• 247

• 251

• 252

• 257

A beam of particles containing protons, neutrons and electrons is fired through an electric field. Which particle will not bend or deviate?

• Proton

• Electron

• Neutron

• All of the above

Which of the following species does NOT have a stable electron configuration (i.e. like those of an inert gas)?

• Cl-

• K+

• Al3+

• Mg+