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THE ATOM
THE ATOM
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Answers
1
Which statement is true about isotopes
same atomic number
different number of protons
same mass number
same number of neutrons
2
Which isotope of lithium is the most abundant in nature?
lithium 10
lithium 9
lithium 6
lithium 7
3
what does the Bohr model of the atom focuses on
Quantum theory
Atomic structure
Chemical bonding
Both 1 and 3
4
how many energy levels does lithium and beryllium have
1
5
3
2
5
What is the atomic number of an atom that has 17 protons
15
17
19
16
6
what is the chemical formula of the compound formed when lithium reacts with flourine
LiF
Li3 F
Li2 F3
LiF2
7
What is the electron configuration of Lithium
1s2 2s2 2p6 3s2 3p6
1s2 2s2 2p4
1s2 2s1
1s2 2s2 2p6 3s2
8
how are electrons distributed in energy levels
orbitals
None
electron shell
both 1 & 2
9
Lithium is more reactive than fluorine
True
False
10
which one of the following statements is false about atoms
atoms are the basic building blocks of matter
atoms cannot undergo nuclear reactions,such as radioactive decay
the number of protons in an atom determines its chemical elements
atoms of different element can combine in specific ratios to form compounds
11
Which group does lithium belong to in the periodic table?
1
2
17
8
12
Electrons were discovered by
Rutherford
Chodwick
Milliken
Thomson
13
What are the three subatomic particles in an atom?
all of the above
electrons
protons
neutrons
14
metal that gives away an electron is cation
True
False
15
Which of the following elements is a non-metal?
potassium
gold
fluorine
lithium
16
Which of the following describes the ionization energy trend in the periodic table?
Decreases from left to right across a period and increases down a group
Increases from left to right across a period and decreases down a group.
Increases both from left to right across a period and down a group
Decreases both from left to right across a period and down a group
17
what term refers to different structural forms of the same element in the same physical state
polymorphs
isomers
allotropes
isotopes
18
which of the following elements have high density
carbon
calcium
potassium
oxygen
19
What is the atomic number of lithium?
5
7
3
6
20
who proposed the atomic theory first
J.J Thomson
Neis Bohr
Robert Millikan
John Dalton
