Characteristics of Atoms

Which of the following best describes an atom?

• protons and neutrons grouped together
• protons and electrons grouped together
• a core (center) of protons and neutrons surrounded by electrons
• a core of electrons and neutrons surrounded by protons

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NGSS.MS-PS1-1

The number of protons in atom which identifies the element is called the :

• atomic number

• mass number

• atomic mass

• nuclide number

Which of the following is correct for a neutral atom ?

• the number of protons and neutrons are the same

• the number of protons and electrons are the same

• the number of electrons and neutrons are the same

• the atomic and mass numbers are the same

The number of protons and neutrons in an atomic is called it's :

• atomic number

• mass number

• oxidation number

• phone number

Atoms of the same element that have a different mass numbers are called :

• ions

• isotopes

• mesons

• plurons

Atoms of the same element with different mass numbers have a different number of :

• protons

• neutrons

• electrons

• mesons

If the number of protons and electrons in an atom are not the same it becomes an electrically charged atom called a (an) :

• isotope

• nuclide

• meson

• ion

What makes an atom have a positive charge?

• more electrons than protons
• more neutrons than electrons
• more protons than electrons
• less protons than electrons

Cobalt (Co) has 27 protons in each atom. Based on this information, which of the following also describes an atom of Cobalt? assuming the atom is neutral

• It has no neutrons.

• It has 27 electrons.

• It has 13 neutrons and 14 electrons.

• It has a total of 86 neutrons and electrons.

Manganese has an atomic mass of 55 and an atomic number of 25. What does this information reveal about most phosphorus atoms?

• They contain more neutrons than protons.
• They contain more protons than neutrons.
• They contain the same amount of protons and neutrons.
• They contain more electrons than neutrons.