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Elements
Page 4
Questions (1,501)
14 carat gold has a purity of 58.3%. How
many moles of gold are in 138 grams of 14 carat gold? Answer in units of moles.
3 answers
asked by
Please help!
590 views
Two representative elements are in the same period of the periodic table. Which statement correctly describes the atoms of the
2 answers
asked by
blu
120 views
Before 1937, all naturally occurring elements had been discovered, but no one had found any trace of element 43. Chemists were
5 answers
asked by
Jameisha
4,117 views
Why are the noble gases the least reactive elements
1 answer
asked by
Sarah
125 views
Carbon, hydrogen, oxygen, and nitrogen are the four most common elements in living things. Which statement BEST describes the
3 answers
asked anonymously
118 views
Which group of elements has the most similar chemical properties? (1 point)
uranium, plutonium, and lead fluorine, chlorine, and
5 answers
asked by
Optimus Prime
2,487 views
Which element has 6 energy levels and 7 valence electrons?
Astatine (At) Polonium (Po) Seaborgium (Sg) Rhenium (Re)
4 answers
asked by
?
1,174 views
Which of the following is Not an element of Rococo art or Architecture?
1. playfulness 2.simplicity 3.asymmetry 4.nature
7 answers
asked by
Riley
2,485 views
You find a compound composed only of element x and hydrogen,and know that it is 91.33% element x by mass. Each molecule has 2.67
4 answers
asked by
Andrew22
5,674 views
On average, earth's crust contains about 8.1% aluminum by mass. If a standard 12-ounce soft drink can contains approximately
7 answers
asked by
Maria
6,731 views
magnesium has 3 isotopes. Magnesium-24 has a percent abundance of 78.99%. Magnesium-26 has a percent of 11.01%. what is the
5 answers
asked by
monique n
3,445 views
Which element is most likely to react with Br?
Sr Ar O K
7 answers
asked by
Shipmunk
1,416 views
Copper is composed of two naturally occurring isotopes: Cu−63 (69.170%) and Cu−65. The ratio of the masses of the two
12 answers
asked by
Vanessa
5,715 views
Antimony forms 2 chlorides having widely different properties. One of the chlorides is a solid that melts at 73*C and contains
4 answers
asked by
sam
1,897 views
It is estimated that uranium is relatively common in the earth’s crust, occurring in amounts of 4 g/metric ton. A metric ton
4 answers
asked by
Leo
2,875 views
Noble gases are the least reactive because they have a perfect 8 valence electrons. Or is it because they do not have any
3 answers
asked by
Joey
882 views
Name two elements that have properties similar those of the element potassium.
4 answers
asked by
Kiersten
2,586 views
a metal x with relative atomic mass 56 forms an oxide with formula X2O3. how many grams of the metal will combine 10g of oxygen
4 answers
asked by
divine
461 views
Examine the three listed elements of Group 13.
boron (B), aluminum (Al), gallium (Ga) If boron has two energy levels, then how
4 answers
asked by
Anonymous
3,737 views
what is the symbol for the element that has 78 protons
76 electrons 117 neutrons and a +2 net charge? i thought it was ^195Os^+2
3 answers
asked by
sara
1,483 views
Can someone explain this to me.
Element D has 6 protons and 7 neutrons Element F has 7 protons and 7 nuetrons are the pair
4 answers
asked by
liz
2,242 views
A metal x with relative atomic mass of 56forms an oxide with formul X2O3 .How many grams of the metals will combine with 10g of
4 answers
asked by
Blessing
2,886 views
Which family/group does the element neon belong to.
4 answers
asked by
sami
1,930 views
What represents the greatest number of phosphorous atoms?
4 answers
asked by
...
1,048 views
If a mineral sample has a mass of 10 g, how many grams of oxygen does it contain?
You need more information than that to
4 answers
asked by
Casey
1,797 views
4. 3 elements are listed by atomic number, #19, 20, and 21. Which property do all of these elements have in common?
They are all
3 answers
asked by
ThatGirl
927 views
Element Z3+ contains 31 protons. What is the identity, and how many electrons does Z3+ have.
4 answers
asked by
Anonymous
3,380 views
A fictitious element X is composed of 10.0 percent of the isotope 55^X , 20.0 percent of the isotope 56^X , and 70.0 percent of
7 answers
asked by
Cassie
9,013 views
in 1807 the English chemist Humphrey Davy passed an electric current through molten potassium hydroxide and isolated a bright,
4 answers
asked by
kimberly
2,403 views
Given that bromine (Br) is a halogen, what can be inferred as true about bromine?
Bromine does not react easily with other atoms.
4 answers
asked by
anna2142
1,309 views
What is the element that forms a 3+ ion with electron configuration [Ar] 3d^6?
I know that [Ar] 3d^6 is Fe, but how can I find an
6 answers
asked by
Ceamus Angelina
2,286 views
An element X burns in air to form an oxide. When the oxide is shaken in water, the resulting solution has a pH greater than 7.
4 answers
asked by
FQXE
787 views
Which element can form more than one kind of monatomic ion?
1. a. Se 2. b. Sn 3. c. S 4. d. Sr
3 answers
asked by
Mark
2,739 views
1. List the elements of the following sets:
A. V is the vowel of english alphabet B. C is the set of number between 5 and 10 C. T
9 answers
asked by
Marlo jun balili
1,027 views
Lithium (Li) bonds with another atom to form a stable molecule with formula LiX. Based on groups in the periodic table, which
4 answers
asked by
ABC
1,454 views
1. For which of these elements would the first ionization energy of the atom be higher than that of the diatomic molecule?
a.
4 answers
asked by
Anonymous
4,515 views
Bromine exists as a mix of bromine 79 and bromine 81 isotopes. an atom of bromine 79 contains:
35 prot.44.neutr.35 electrons 35
6 answers
asked by
Andy
2,099 views
Which one of the following has a symbol that is not derived from its foreign name?
1) aluminum 2) mercury 3) lead 4) copper 5)
3 answers
asked by
Anonymous
615 views
There are three naturally occurring isotopes
of the hypothetical element hilarium 41Hi, 42Hi, and 44Hi. The percentages of these
4 answers
asked by
anonymous
2,981 views
One property used to broadly classify elements is malleability. If a substance is malleable, it can be hammered, shaped, and
4 answers
asked by
Anonymous
866 views
Explain why the Noble Gases are unreactive
4 answers
asked by
Hailey
2,176 views
I am a main group element.
I have 3 p-orbital electrons in my valence shell. I have a lower first ionization energy than arsenic.
3 answers
asked by
Mat
1,091 views
why were sodium and magnesium not discovered until recent times?
4 answers
asked by
kirsten
1,466 views
An unknown element, X, combines with aluminum to form a compound with the formula Al3X2. What would be the most likely formula
3 answers
asked by
Bart
401 views
What element has 6 valence electrons and 6 energy levels?
3 answers
asked by
Adam
995 views
The coinage metals - copper, silver, and gold - are considered to be a chemical family. List three arguments to explain why.
Plea
3 answers
asked by
Alexis
3,157 views
which of the following categories includes two-thirds of all elements?
a.Metalloids b.metals c.liquids d.nonmetals C. I know
3 answers
asked by
Deb
1,824 views
Which one of the following is an alkaline earth element? a) carbon b)sodium c)zinc d)iron
5 answers
asked by
gaurav verma
2,025 views
The element boron has three naturally occuring isotopes. One has the atomic mass 10.0129(54.4%), another 11.0093(12.75%). What
4 answers
asked by
Anonymous
1,016 views
In 1928, 1.0 g of Re was isolated from 660 kg of the ore molybenite. The percent by mass of this element in the molybenite was:
1
3 answers
asked by
Anonymous
1,401 views
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