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Question
Helium is a(n)A) compound.
B) heterogeneous mixture.
C) element.
D) homogeneous mixture.
E) electron.
Answer
This answer is hidden. It contains 1 characters.
Related questions
Q:
A nuclear equation is balanced when
A) the same elements are found on both sides of the equation.
B) the sum of the mass numbers and the sum of the atomic numbers of the particles and atoms are the same on both sides of the equation.
C) the same particles and atoms are on both sides of the equation.
D) different particles and atoms are on both sides of the equation.
E) the charges of the particles and atoms are the same on both sides of the equation.
Q:
If absorbed internally, alpha particle emitters are the most damaging because alpha particles
A) have the largest charge.
B) have the greatest energy.
C) have the greatest mass.
D) consist of high energy electrons.
E) consist of pure energy.
Q:
The process in which a nucleus spontaneously breaks down by emitting radiation is known as
A) transmutation.
B) transformation.
C) fusion.
D) a chain reaction.
E) radioactive decay.
Q:
The symbol e is a symbol used for a(n)
A) proton.
B) neutron.
C) gamma ray.
D) beta particle.
E) alpha particle.
Q:
Choose the type of radiation from Column 2 that best matches each item in Column 1.A) beta particleB) positronC) alpha particleD) protonE) neutronF) gamma ray1> 2> 3> 4> H5> n6> e7> e
Q:
The diagnostic imaging technique that depends on magnetic fields and radio waves, not radioactivity, is called ________.
Q:
Sr -> ________ + e + energy
Q:
U + n -> ________ + Kr + 3n + energy
Q:
Classify the following elements as metals, nonmetals or metalloids.
A) metalloid
B) nonmetal
C) metal
1> chlorine
2> cobalt
3> sulfur
4> silicon
5> nickel
Q:
Chlorine has more metallic character than fluorine.
Q:
Ionization energy increases going down a group.
Q:
A sodium atom is larger than a silicon atom.
Q:
Of the elements: B, C, F, Li, and Na. The element with the highest ionization energy is
A) B.
B) C.
C) F.
D) Li.
E) Na.
Q:
The number of valence electrons found in an atom of a Group A element is equal to
A) its atomic number.
B) its mass number.
C) its group number.
D) eight.
E) eight minus the group number.
Q:
What is the abbreviated electron configuration for nickel (atomic number 28)?
A) [He]2s22p3
B) [Ar]4s23d8
C) [Kr]4s23d8
D) [Ar]4s24p4
E) [Ar]3d8
Q:
What is the electron configuration for potassium (atomic number 19)?
A) 1s22s22p63s23p7
B) 1s22s22p6 3s23p53d2
C) 1s22s22p83s23p5
D) 1s22s22p63s23p64s1
E) 1s22s22p63s23p54s1
Q:
The elements sodium, magnesium, and silicon
A) are isotopes of each other.
B) are in the same period of elements.
C) have the same number of neutrons.
D) are in the same group.
E) have the same mass number.
Q:
Which of the following is NOT true for the atoms 13N, 14N, and 15N?
A) They all have the same mass number.
B) They are isotopes.
C) They all have the same atomic number.
D) They all have 7 protons.
E) They all have 7 electrons.
Q:
The correct symbol for the isotope of potassium with 22 neutrons is
A) K.
B) K.
C) P.
D) P.
E) K.
Q:
The number of neutrons in an atom is equal to
A) the atomic number.
B) the mass number.
C) the mass number + the atomic number.
D) the mass number - the atomic number.
E) the number of protons.
Q:
According to the Atomic Theory,
A) all atoms are different.
B) atoms are neither created nor destroyed during a chemical reaction.
C) atoms of the same element combine to form compounds.
D) all matter is made up of tiny particles called electrons.
E) a compound can contain different numbers of atoms as long as it has the same kinds of atoms.
Q:
The smallest particle of an element that retains the characteristics of the element is a(n)
A) electron.
B) neutron.
C) proton.
D) atom.
E) nucleus.
Q:
Semiconductors are located in the periodic table on (or in) the
A) left side of the table.
B) right side of the table.
C) line dividing metals from nonmetals in the table.
D) first period of the table.
E) last period of the table.
Q:
Identify the metalloid in the following list.
A) sulfur
B) fluorine
C) silver
D) copper
E) germanium
Q:
Which of the following elements is a metal?
A) nitrogen
B) fluorine
C) argon
D) strontium
E) phosphorus
Q:
Which of the following is a characteristic of the modern periodic table?
A) A group is a horizontal row on the periodic table.
B) A period is a column on the periodic table.
C) The elements in each group have similar chemical properties.
D) The B groups contain the representative elements.
E) The A groups contain the transition elements.
Q:
Select the correct symbol for the element.
sodium
A) So
B) Na
C) No
D) Sm
E) Au
Q:
Select the correct symbol for the element.
iron
A) Ir
B) Fs
C) Fe
D) In
E) FE
Q:
Select the correct symbol for the element.
aluminum
A) Al
B) Am
C) Au
D) Sn
E) Ag
Q:
As a solid melts, its temperature does not change.