Question

1. (partially visible question about a metal in group 1)

a. there was noone else to put it
b. it has one electron in its outermost shell
c. it tends to form a diatomic molecule
d. it has more than one electron shell

1. what subatomic particles did j thomson discover with his experiment?

a. protons
b. electrons
c. photons
d. neutrons

1. neon is placed in group 18 on the periodic table because

a. it has a valence of eight
b. it is highly reactive
c. it has a full outer shell of electrons
d. it is a metal

1. which scientist proposed the plum pudding model of the atom?

a. james chadwick
b. john dalton
c. ernest rutherford
d. j thomson

1. when the existence of the neutron was confirmed, what did this lead to the discovery of?

a. the nucleus
b. isotopes
c. electron paths
d. neutrons

1. the elements on the periodic table are arranged in ____ based on similar characteristics and ____ based on how many electron shells are available.

a. periods; groups
b. periods; periods
c. groups; groups
d. groups; periods

1. based on its location on the periodic table, what are the expected properties of cesium?

a. metallic, large radius
b. nonmetallic, large radius
c. metallic, small radius
d. nonmetallic, small radius

1. which group or family is otherwise known as the \semimetals\?

a. halogens
b. transition metals
c. alkaline earth metals
d. metalloids

1. use the timeline to answer the question. the timeline shows early work on the model of the atom. which diagram best matches thomson’s model of the atom?

(timeline: 1803 dalton’s model (solid spherical, indivisible); 1904 thomson’s model (?); 1911 rutherford’s model (small dense positively charged nucleus with mostly empty space containing electrons))
(diagrams:
a. negative electrons mixed with electrically positive substance
b. tiny nucleus with electron orbits
c. electrons orbiting in precise paths about a small nucleus
d. neutrally charged neutrons with protons in nucleus and electrons outside the nucleus)

Explanation:

Question 12

J.J. Thomson discovered electrons through his cathode ray experiment. Protons were discovered by Rutherford, neutrons by Chadwick, and photons are related to light energy.

Neon is a noble gas in group 18. Noble gases have a full outer shell of electrons (octet or duplet for He). Valence of eight is incorrect terminology (valence electrons for noble gases except He is 8, but the reason for group 18 is full outer shell). Noble gases are inert, not highly reactive, and neon is a non - metal.

J.J. Thomson proposed the plum - pudding model of the atom, where electrons are embedded in a positively charged "soup". James Chadwick discovered neutrons, John Dalton proposed the atomic theory, and Ernest Rutherford proposed the nuclear model of the atom.

Answer:

b. Electrons

Question 13