Atoms Elements Compounds

Use the periodic table to help answer the following question.

Which element is represented by the Bohr model shown?

• boron

• chlorine

• magnesium

• nitrogen

Tags

NGSS.MS-PS1-1

An isotope of an unknown element has 17 neutrons and a mass number of 32. What is the symbol of this isotope?

• ³² P

  ¹⁵

• ³² Cl

  ¹⁷

• ¹⁷ P

  ³²

• ³² Ge

  ¹⁷

Tags

NGSS.MS-PS1-1

An atom's mass number is composed of the total number of _______ contained in an atom.

• protons and electrons

• atoms

• protons and neutrons

• neutrons and electrons

An atom of fluorine has the atomic number 9, and its mass number is 19 amu.

Which of the following shows an ion of fluorine?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

An atom has 33 protons, 41 neutrons, and 36 electrons. What is a correct description of the atom?

• an ion with a net charge of 3-

• an atom with an atomic mass of 36

• an atom with an atomic mass of 33

• an ion with a net charge of 3+

Malleability is a physical property of matter. Malleable materials can be flattened into thin sheets through hammering or rolling.

Which of the following materials could be malleable?

I. metals

II. metalloids

III. nonmetals

• II and III only

• I, II, and III

• I and II only

• I and III only

Look at the Bohr model of the helium atom shown above.

What part of the atom is represented by the letter Y?

• nucleus

• electron

• proton

• .neutron

Tags

NGSS.MS-PS1-1

How can a neutral atom become a positively-charged particle?

• It could lose electrons

• It could lose protons

• It could gain ions

• It could gain neutrons.

Which of the following elements would most likely have the physical property of malleability?

• N

• Cu

• He

• P

Isotopes are atoms of the same element that have a different number of _______.

• neutrons

• protons

• ions

• electrons