Which statement best describes Krypton?

Noble gas, extremely unreactive b/c valence shell is full

negatively charged subatomic particle

17 protons, 17 electrons, 18 neutrons

If an atoms outer energy level is full it is

unlikely to form bonds with other atoms

are mostly gases at room temperature

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Physical Science- Atoms & Periodic Table

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Questions 23

Answers

1
In a neutral atom, the atomic # =
neutrons
protons
electrons
protons + neutrons
2
Protons...
determine identity of an element
= electrons in an ion
= neutrons in an atom
negatively charged subatomic particle
3
Neutrons...
= electrons in an ion
= protons in an atom
negatively charged subatomic particle
can vary from atom to atom, creating isotopes
4
Which statement best describes Krypton?
Noble gas, extremely unreactive b/c valence shell is full
Halogen, extremely unreactive b/c valence shell is 1/2 full
noble gas, extremely reactive b/c valence shell is full
halogen, extremely reactive b/c valence shell is full
5
Electrons...
determine identity of an element
negatively charged subatomic particle
= neutrons in an atom
= protons in an ion
6
An element is a good conductor. It is most likely a
metalloid
metal
answer cannot be obtained from info given
nonmetal
7
The most reactive atoms tend to have
1 or 7 valence electrons
8 valence electrons
4 or 5 valence electrons
no valence electrons
8
A Sulfur ion has lost one electron, but has 16 protons. What is its charge?
answer cannot be obtained with info given
-1
0
+1
9
Which elements have the same number of valence electrons?
N, O
N, P
Al, Si
P, S
10
Which will have a charge of -2
p = 8, n = 9, e= 10
p = 8, n = 10, e= 8
p = 10, n = 10, e= 10
p = 10, n = 9, e= 8
11
Chlorine has
17 protons, 17 electrons, 17 neutrons
18 protons, 18 electrons, 17 neutrons
17 protons, 17 electrons, 18 neutrons
18 protons, 18 electrons, 18 neutrons
12
What elements, found on the left side of the P. Table, usually donate electrons, have + charge
nonmetals
metalloids
metals
alkaline metals
13
A material conducts heat and electricity well. It is most likely
gas
nonmetal
liquid
metal
14
Which list contains elements that are all in the same period?
Si, P, S, Br
Al, P, Ar, Na
H, Li, Na, K
N, O, F, Ar
15
Carbon is located in group 14 because
it has 4 valence electrons
It has an average atomic mass of 12.011
there was nowhere else to put it
it's a nonmetal
16
Subatomic particles with same mass
protons and neutrons
none of these
protons and electrons
neutrons and electrons
17
If an atoms outer energy level is full it is
unlikely to form bonds with other atoms
unlikely to have an atomic number
likely to form bonds with other atoms
likely to have unstable isotopes
18
nonmetals
are mostly solids at room temperatures
have properties of both metals and metalloids
are mostly gases at room temperature
have low densities and have low melting points
19
Which particle is outside of the nucleus
electron
all of these
neutron
proton
20
Average Atomic Mass of Magnesium
12
24
24.305
12.305
21
A neutral atom of which element contains 13 electrons?
Silicon
Gallium
answer cannot be obtained with info given
Aluminum
22
Two atoms exhibit similar properties. They have the same number of protons, but diff mass #s
They're ions
They have different numbers of electrons
Answer cannot be obtained from given info
They're isotopes
23
Which of the following elements would be least reactive?
O
F
Ne
N

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