Which of these statements about Bohr's model of the atom is incorrect?
Electrons occupy orbits with certain radii corresponding to discrete energies
Elements with the same number of electrons in their outer orbit have similar properties.
Electrons fill lower energy orbits first
All of these statements are correct
all of them are correct
Which of these particles has a negative charge?
Which of these statements best describes the formation of a cation?
An atom loses one or more electrons and becomes positively charged
Which of these is the correct chemical symbol for cobalt?
Which of these is the correct chemical symbol for potassium?
Calculate the number of moles in a 25.0 g sample of carbon
Which of the following is not true for an atom that has an atomic number of 19 and a mass number of 41?
The atom contains 19 neutrons.
Mendeleev organized the elements of the periodic table
by increasing atomic weight and similar properties
Which of these statements concerning atomic weights is correct?
Atomic weights are calculated based on the masses and abundances of the naturally occuring isotopes.
Which of these statements about atoms is incorrect?
Atoms are the smallest visible amount of an element.
The number of protons in a neutral atom is equal to the ____ of the atom
Determine the correct number of protons and electrons in F−?
9 protons, 10 electrons
Determine the correct number of protons and electrons in P3− ?
15 protons, 18 electrons
What is the charge on an ion that contains 16 protons and 18 electrons?
The Ca2+ ion contains ____ protons and ____ electrons.
What are the Z and A values for an atom of silicon which contains 15 neutrons?
Which statement about electrons is incorrect?
Electrons exist in the nucleus of the atom
How many protons (p), neutrons (n), and electrons (e) are in an atom of 235U?
92 p, 143 n, 92 e
Elements in the same group have the same ____
number of valence electrons
Which of these is the correct chemical symbol for carbon?
Radon −222 has ____ protons, ____ neutrons, and ____ electrons
86, 136, 86
Which scientist is responsible for the organization of the modern Periodic Table?
When an oxygen atom gains two electrons, it becomes (a)n ____ with a charge of ____.
The Cl− ion contains ____ protons and ____ electrons.
Chlorine has two isotopes, 35Cl and 37Cl that have the respective percent abundance's of 75.77% and 24.23% and masses of 34.9688 amu and 36.9659 amu. Calculate the atomic weight of chlorine.
Determine the mass in grams of one molecule of water, H2O?
2.99 × 10−23 g
A certain ion contains 47 protons and 46 electrons. The ion is:
Which of these particles has the smallest mass?
What are the Z and A values for an atom of krypton which contains 46 neutrons?
Which of these elements is a metalloid
Which of these elements has two valence electrons?
Rubidium consists of two naturally occurring isotopes rubidium-85 and rubidium-87. Rubidium-85 (85Rb) has an isotopic mass of 84.9117 amu and a 72.15% abundance. Rubidium-87(87Rb) has a 27.85% abundance. The atomic weight of rubidium is 85.4768 amu. Determine the isotopic mass of 87Rb?
How many protons, neutrons and electrons are in an 25Mg+2 ion?.
12 protons, 10 electrons, 13 neutrons
Bromine is a member of what group/family?
Isotopes of an element have the same number of ____ but a different number of ____.
Which element is not a non-metal?
Which scientist is responsible for the theory which explains why properties of elements recur in a periodic fashion?
The elements of group IA will all form ions. These ions will be ____ and will have a charge of ____.
These elements Li, Na, K, Rb and Cs are members of what group/family?
Strontium is a member of what group/family?
alkaline earth metals
What is the correct number of atoms in one mole of aluminum?
6.022 × 10 23
Determine the number of atoms in a copper strip that has a mass of 35.0 grams
3.32 × 1023 atoms
The elements of group VIIA will all form ions. These ions will be ____ and will have a charge of ____.
Calculate the number of moles of lead in a 442 gram lead anvil.
Which of these elements is not a transition metal?
Which of the following has the largest mass of oxygen?
6.022 × 1023 molecules of O2
What is the correct number of atoms in one mole of neon?
6.022 × 10 23
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