8/9/2019 11Chem Chapter 1 & 2 Assignment

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Year 11 ChemistryChapter 1 & 2 Assignment: A particleview of matter

DUE: NAME: Amy Yo

!1"Which of these proposals corresponds to the ideas put forward by John Daltonin 1804?

# Matter consists of indivisible particles.## Atos of a particular eleent can vary in their ass.

### !he proportion and type of ato is always the sae in a particular

copound.A " only.$ " and "".C " and """.D "# "" and """.

!2"When he $rst constructed his periodic table# Mendeleev arran%ed the &nowneleents'A in order of their atoic nuber.$ accordin% to their electron con$%uration.

C into vertical %roups accordin% to their ass nuber.D into hori(ontal periods accordin% to their atoic ass.

!%")rnest *utherford contributed to &nowled%e about the structure of the ato by'A discoverin% the coposition of alpha particles.$ discoverin% that protons are found in the nucleus of an ato.C provin% the e+istence of neutrons in the nucleus of an ato.D proposin% that electrons ove in circular orbits around the nucleus.

!"A particular ato of potassiu has an atoic nuber of 1, and a assnuber of -,. !he nuber of protons present in the /ion is'A 18$ 1,C 0D 1

!'"

!he nuber of protons p2# neutrons n2 and electrons e2 in +32713Al is'

A 1-p# 14n# 10e

$ 1-p# 3n# 1-eC 1p# 14n# 1-eD 3p# 1-n# 10e

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8/9/2019 11Chem Chapter 1 & 2 Assignment

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!("!he isotopes of an eleent have the sae'A atoic nuber and ass nuber.$ nuber of protons and neutrons.C nuber of protons and electrons.D nuber of neutrons and electrons.

!)"

!he electron con$%uration of 23216S is'

A 1ssp-s-p4.$ 1ssp-s-p.C 1ssp-s-p-d104s.D 1ssp-s-p-d104s4p.

!*"!he electron con$%uration of an ato in an e+cited state is'

A 1s

s

p

-s

-p

-d

-

4s

.$ 1ssp-s-p-d-4s4p.C 1ssp-s-p-d104s.D 1ssp-s-p-d104s4p4.

!+"!he 5auli e+clusion principle states that'A all atoic orbitals ust hold two electrons.$ an atoic orbital ust hold a iniu of two electrons.C a new subshell is started whenever an atoic orbital holds two electrons.D an atoic orbital ay hold a a+iu of two electrons.

!1,"a 6ive the %round7state electron con$%uration of calciu# a.

- )+plain# %ivin% an e+aple of the new electron con$%uration# what happensto the ener%y levels of the electrons when the ato in the %round state isprovided with su9cient ener%y to becoe'i an e+cited ato.

ii a char%ed ion.

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c !he stable ion of a%nesiu is a/. What would be the di:erence inatoic radius of a a ato and a a/ion?

!11""t is appro+iately 00 years since John Dalton proposed that atter wascoposed of indivisible particles called atos. Most of the evidence for thee+istence of subatoic particles was not found until the early part of the 0thcentury.a )rnest *utherford and his co7wor&ers $red alpha particles at a thin sheet of

%old foil and easured the de;ection produced in the path of the alphaparticles. s odel proposed that ost of the ass of an atoand all of the positive char%e ust be located in a tiny central re%ion thathe called the nucleus# ost of the volue of an ato is epty space

occupied only by electrons# the electrons ove in circular orbits around thenucleus and the force of attraction between the positive nucleus and thene%ative electrons is electrostatic.

- "n 1,1-# iels