Science unit 3
By looking at a periodic table, Juan finds the following information for rubidium. Symbol Rb Atomic number 37 Atomic mass 85 how many protons does a rubidium atom have? Use the table above to answer the question. a 37 b 48 c 85 d 122
a
What would happen to the current model of the atom if new information about its structure is discovered in the future? a The current atomic model would be revised b The current atomic model would be strengthened c The current atomic model would be proven d The current atomic model would be defended
a
How can you describe the location of vanadium (V, Atomic number 23) on the periodic table? Choose all that apply. (2 pt) a period 5, group 4 b period 4, group 5 c lanthanide series d nonmetals e transition metals
b e
A particular neutral uranium atom had 92 protons, 143 neutrons, and an atomic mass of 235. How many electrons does the atom have? a 92 b 143 c 235 d 337
a
What conclusion can be drawn about the relationship between the arrangement of elements on the periodic table and the patterns observed in their properties? a Properties of elements are related to atomic numbers b Properties of elements are related to ductility c Properties of elements are related to malleability d Properties of elements are related to luster
a
What is true about the element calcium (Ca, atomic number 20)? Choose all that apply. (3pt) a It has 2 valence electrons b It has 4 valence electrons c it has a nonmetal d it is reactive e it is a metal
a d e
The modern atomic model includes electrons orbiting the nucleus. Which of the following parts of Dalton's atomic model was disproved by the discovery of the electron? a Atoms are tiny particles. b Atoms cannot be divided into smaller parts c Atoms have specific mass and size d Atoms have specific chemical properties
b
Use the image to answer the questions 3 and 4 The image above shows the nucleus of a nitrogen atom. How can the atomic number of nitrogen be determined? a Count the number of neutrons b Count the number of protons c Add the number of protons and neutrons d Count the number of electrons
b
Which is most likely to be part of an ionic bond? a An atom with no valence electrons b An atom with one valence electron c An atom with two valence electrons d An atom with three valence electrons
b
Which physical properties are characteristic of metals? Choose all that apply. (3pt) a brittle b high luster c malleable d ductile e not very reactive
b c d
What is true about the element francium (Fr, atomic number 89)? Choose all that apply 3pts a it has seven valence electrons b it is likely to form ionic bonds c it is a nonmetal d it is in perion 7 e it is a metal
b d e
Ernest Rutherford's atomic model included a nucleus comprised of positive particles called protons. Later, James Chadwick discovered neutrons. How did Chadwick's discovery change the atomic model? a The new model showed a negatively charged nucleus b The new model showed a neutrally charged nucleus c The new model showed a larger electron cloud d The new model showed a nucleus with tow types of particles
d
use image to answer question 5 To which region of the atom is the arrow pointing? a electron cloud b electron orbit c neutral d nucleus
d
