Atoms

The charge of an atom is determined by the -

• shape of the electron cloud

• atomic mass of the element.

• radius of the outermost electron.

• number of protons and electrons.

Which of the following lists the two subatomic particles that contribute the most to the mass of an atom?

• Protons and electrons

• Protons and neutrons

• Neutrons and electrons

• Electrons and ions

Which of the following atoms would have a charge of 1?

• An atom with 9 protons, 9 electrons, and 9 neutrons

• An atom with 7 protons, 11 electrons, and 8 neutrons

• An atom with 5 protons, 5 electrons, and 4 neutrons.

• An atom with 6 protons, 5 electrons, and 7 neutrons

The nucleus of the atom contains 8 protons and 9 neutrons. The atom is electrically neutral. How many electrons does this atom have?

• 4

• 8

• 9

• 15

Tags

NGSS.MS-PS1-1

How many protons does chlorine have?

• 35

• 36

• 17

• 18

Silicon has a mass number of 28 and an atomic number of 14. How many protons does it have?

• 28

• 14

• 42

• 7

Tags

NGSS.MS-PS1-1

How many protons, neutrons, and electrons does sulfur have? It's atomic number is 16 and it's atomic mass is 32.

• 16 protons, 16 neutrons, and 16 electrons

• 16 protons, 32 neutrons, and 16 electrons

• 16 protons, 16 neutrons, and 32 electrons

• 32 protons, 16 neutrons, and 16 electrons.

Tags

NGSS.MS-PS1-1

A certain atom has 11 electrons, 8 neutrons, and a charge of -1. What is its atomic mass?

• 19

• 15

• 11

• 18

Tags

NGSS.MS-PS1-1

What is the difference between the number of electrons in an atom of oxygen, O, and the number of electrons in an atom of hydrogen, H?

• 9

• 8

• 7

• 1

An atom of a certain element has 11 electrons, and a mass number of 23. This element is very reactive in room temperature. How many neutrons are in this atom?

• 11

• 12

• 33

• 23