Open Sci Ed Lesson

The atoms of a certain element each contain 18 protons and 8 valence electrons.

What is the element's name?

• Argon

• Krypton

• Neon

• Sodium

Tags

NGSS.MS-PS1-1

How many protons will the element in Group 7A, Period 4 have?

• 9

• 16

• 34

• 35

What element has similar properties of Cesium (Cs), but a larger atomic mass?

• Magnesium (Mg)

• Barium (Ba)

• Rubidium (Rb)

• Francium (Fr)

How many neutrons will an atom of Calcium (Ca) have?

• 10

• 14

• 16

• 20

Tags

NGSS.MS-PS1-1

An atom of a certain element has 53 protons, 53 electrons and a mass number of 127.

How many neutrons are in this atom?

• 64

• 74

• 106

• 180

Tags

NGSS.MS-PS1-1

An element is shiny, solid at room temperature, and has two valence electrons. Which of these elements could be in this group?

• Lithium (Li)

• Strontium (Sr)

• Aluminum (Al)

• Silicon (Si)

The electron cloud contains electrons and --

• protons

• neutrons

• gas and dust

• empty space

Tags

NGSS.MS-PS1-1

Which of the following is the best description of an atom?

• A core of protons surrounded by electrons

• Protons and neutrons grouped in loose arrangements

• A core of protons and neutrons surrounded by electrons

• Protons, neutrons, and electrons grouped in a solid core

Tags

NGSS.MS-PS1-1

What statement about a proton is correct?

• A proton has no electrical charge

• A proton has a positive electrical charge

• A proton has a negative electrical charge

• A proton can have either a positive or a negative electrical charge

A neutral atom is an atom with the same number of:

• electrons and neutrons

• protons and neutrons

• protons and electrons

• electrons and valence electrons