Matter and Periodic Table

An atom of a certain element has 4 energy levels and 2 electrons in its outer energy level.  How many protons would this element have?

• 38

• 32

• 20

• 6

Tags

NGSS.MS-PS1-1

Which element is a halogen gas with 3 energy levels?

• Argon

• Neon

• Flourine

• Chlorine

Which list of elements contains only metals?

• tellurium, selenium, carbon

• sodium, nickel, mercury

• hydrogen, calcium, platinum

• chlorine, krypton, radon 

Which of the following is an alkali metal?

• Argon 

• Barium

• Magnesium

• Potassium

What is the difference between a Lead-204 and a Lead-206 atom?

• The overall charge on the atom.

• The number of valence electrons.

• The number of neutrons in the nucleus.

• The atomic number of the element.

Neutrons are particles that

• help make up the nucleus and have no charge.

• help make up the nucleus and are positively charged.

• are located outside of the nucleus and are negatively charged.

• are located outside of the nucleus and have no charge.

Which statement about the atom’s nucleus is correct?

• The nucleus is made of protons and neutrons and has a negative charge.

• The nucleus is made of protons and neutrons and has a positive charge.

• The nucleus is made of electrons and has a negative charge

• The nucleus is made of electrons and has a positive charge

What is the mass number of an element that has 17 protons, 17 electrons, and 18 neutrons?

• 17

• 18

• 34

• 35

Tags

NGSS.MS-PS1-1

An atom has no overall charge if it contains equal numbers of

• Neutrons and protons

• Neutrons and electrons

• Electrons and protons

• None of the above

Atoms that have unequal numbers of protons and electrons are called what?

• Atoms

• Ions

• Isotopes

• Molecules