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What is the Lewis structure for NH4+?

How many valence electrons does a sodium, silicon, beryllium, and oxygen atom have?

What is the charge of CH₃COO, also known as the acetate ion?

What is the correct Lewis structure for CN^- (cyanide ion)?

What is the chemical formula for chlorine with its ionic charge?

Part A: What are the electron and molecular geometries, respectively, for the carbonate ion, CO2−3 ​ ?

Caffeine's molecular formula is C8H10N4O2. The molar mass of caffeine is 194 g/mol. What is the percentage of carbon in caffeine?

Share at least one example of each element of conductivity. Include key points (about 3) and briefly share your experience about this activity.

Write the balanced chemical equation for the reaction of KHP with NaOH.

Identify the subshell from which an electron is removed to form a cation.

The molecular geometry (shape) of the H3O+ ion is: A. octahedral B. trigonal planar C. trigonal pyramidal D. bent E. tetrahedral

On the periodic table, gold has the atomic number 79. This means that: A. an atom of gold has 79 protons and electrons combined. B. gold can be found in 79 isotopes. C. gold was the 79th element discovered. D. an atom of gold has 79 protons.

Silver has an atomic number of 47. Give the number of protons, neutrons, and electrons in a neutral atom of the most common isotope, Ag-107.

What is the bond order of Li2− ? Express the bond order numerically.

Using the electron configuration, how many valence electrons does sulfur (S) have? HINT: Sulfur’s atomic number is 16.

Determine the electron geometry and molecular geometry of XeF4.

How many valence electrons does boron have?

Why does electronegativity decrease down a family?

Spell out the full name of the compound: 3-methyl-2-pentene.

Give the formula for barium bisulfate. A. Ba₂HSO₄ B. Ba₂(HSO₃)₂ C. Ba(HSO₄)₂ D. BaHSO₄

"In the element helium, how many protons, neutrons, and electrons are there? Protons: 2 Neutrons: 2 (assuming the most common isotope, Helium-4) Electrons: 2 Element: He (Helium) Atomic Mass: 4.002602"

How many valence electrons does Ne have, and why is it considered stable?

What is the molecular shape of HCN?

The ionic charge of lead, Pb, in the compound PbS₂ is ____

Gold is represented by the symbol Au on the periodic table of the elements. This allows us to infer that gold is a(n) ________.

What is the mass of 3.81 mol of PH₃? A. 34.0 g B. 3.81 g C. 8.92 g D. 130.0 g E. 0.112 g Show your work on scratch paper.

What is the Lewis dot structure for PF5?

Determine the electron geometry, molecular geometry, and polarity of SF6 .

How many valence electrons does carbon have?

What is the name of the molecular compound SO3? A. sulfur oxide B. sulfur(IV) oxide C. sulfur trioxide D. sulfur tetraoxide E. none of the above

Calculate the number of oxygen atoms in a 110.0 g sample of forsterite (Mg2 SiO 4 ). Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

Is CO2 covalent, ionic, or both?

Draw the Lewis structure of CH3OH (methanol), a neutral compound. Draw the Lewis dot structure of CH3OH.

Determine the number of protons, electrons, and neutrons present in an atom of calcium (Ca). Explain how you determined your answer using complete sentences. | **sodium 11 Na 22.990** | **magnesium 12 Mg 24.305** | | | --- | --- | --- | | potassium 19 K 39.098 | calcium 20 Ca 40.078 | scandium 21 Sc 44.956 | | rubidium 37 Rb 85.468 | strontium 38 Sr 87.62 | yttrium 39 Y 88.906 |

"How many valence electrons are in an atom of the element fluorine? A. Seven B. Two C. Eight D. Five"

Describe the difference between covalent and ionic bonds. Give one example of each.

How many valence electrons does magnesium (Mg) have?

"List 4 characteristics of water that are emergent properties resulting from hydrogen bonding. Cohesion High specific heat Expansion upon freezing Solvent properties"

Atomic number of aluminum is 13 and mass number is 27. Calculate the number of electrons, protons, and neutrons in its atom. Represent the ion of this element.

"Construct Explanations: Why is it incorrect to name the chemical compound P 2 ​ O 5 ​ as diphosphorus pentaoxide?"