2.1 Lesson Review: Modeling Atomic Structure

Which statement is true according to modern atomic theory

• Atoms are small, indivisible spheres
• Atoms don't combine with other atoms
• The number of neutrons identfies an element
• Atoms of the same element can have different mass numbers

Which conclusion can be drawn from a cathode ray being deflected toward the positive plate

• Atoms are indivisible
• There is gas in the tube
• The particles of a cathode ray are negatively charged
• The particles of a cathode ray are positively charged

Which atomic particle has about the same mass as a proton but has no electrical charge?

• neutron
• electron
• quark
• positron

Which scenario will produce light?

• an electrong moving into the nucleus
• an electron moving out of a nucleus
• an electron moving to the lowest energy level (ground state)
• an electron moving to the outermost level (valence electron)

which term best describes the Which term describes the three-dimensional region around a nucleus where an electron may be found?

• energy shell
• spectral line
• nuclear ring
• electron orbit

Which statement is the difference between a 1s subshell and a 2s subshell?

• The 2s subshell is at a higher energy level than the 1s
• The 2s subshell has a different shape
• The 2s subshell is at a lower energy level
• The 1s subshell is at a higher energy level than the 2s

An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. What is its mass number?

• 26
• 27
• 40
• 13

During an experiment, four different elements wer added to water and observed. Element C showed no reaction. The other three elements bubbled, with Element D bubbling with the greatest vigor and Element A bubbling the least. Which list orders the elements from least restrictive with water to most reactive with water?

• A,B,C,D
• B,D,A,C
• C,A,B,D
• C,B,D,A

An experiment carried out by J.J. Thomson that led to the discovery of the electron.

• amu
• Ion
• In elements with a neutral charge...
• Cathode Ray Tube Experiment

Bromine, atomic number 35, belongs to Group 17. How many valance electrons does bromine have in its outermost shell? Refer to the periodic table.

• 35
• 17
• 7
• 18