Atomic Structure Review

A neutral atom has...

• An equal number of protons and electrons

• An equal number of protons and neutrons

• The number of neutrons balances out the number of protons and electrons

• The nuclear forces neutralize the atom

The smallest particle of an element that retains the properties of that element is a(n)

• electron

• atom

• proton

• quark

An element has an atomic number of 45. The number of protons and electrons in a neutral atom of this element is

• 45 protons and 45 electrons

• 45 protons and 0 electrons

• 12 protons and 13 electrons

• none of the above

Identify the element that has 74 neutrons and a mass number of 127.

• iodine

• tungsten

• iron

• selenium

Tags

NGSS.MS-PS1-1

Which one equals one atomic mass unit (amu)?

• the mass of protons plus neutrons

• 1/12 the mass of one carbon-12 atom

• mass of one electron

• the mass of one atom

Bohr's model of the atom shows the electrons are...

• mixed evenly with the positive charge

• found orbiting a positively charged nucleus

• found orbiting a positively charged nucleus in energy levels he called orbits

• found in regions of probability around the nucleus called orbitals

Which of the following is applicable to Thomson's model?

• electrons are evenly mixed with the positive charge

• electrons are found orbiting a positively charged nucleus

• electrons are found orbiting a positively charged nucleus in energy levels he called orbits

• electrons are found in regions of probability around the nucleus called orbitals

Which of the following is applicable to Rutherford's model?

• electrons are mixed evenly with the positive charge

• electrons are found orbiting a charged nucleus

• electrons are found orbiting a positively charged nucleus in energy levels he called orbitals

• electrons are found in regions of probability around the nucleus called orbitals

Which can vary among neutral atoms of the same element?

• mass number

• number of protons

• atomic number

• number of electrons

Which of the following is the correct average atomic mass calculation for nitrogen, given the following information?

95% with 14amu

3% with 15amu

2% with 16amu

• (0.95)(14)+(0.03)(15)+(0.02)(16)=14.07amu

• (95)(14)+(3)(15)+(2)(16)=14.07amu