Counting Atoms
In Ca(OH)₂ (calcium hydroxide), how many atoms are present
What is 5
The name of the element with the symbol O
What is Oxygen
The chemical symbol for Arsenic
As
This is what the atomic number tells you about an atom?
The atomic number equals the number of protons in the nucleus (and, for a neutral atom, the number of electrons).
What does atomic mass (approximately) tell you about an atom? (Short answer)
Atomic mass gives the average mass of atoms (protons + neutrons) in atomic mass units; it approximates how heavy an atom is.
In Al₂(SO₄)₃ (aluminum sulfate), how many atoms are present
What is 17
The name of the element with atomic number 11
What is Sodium
Write the symbol for iron
Fe
Chlorine has the atomic number 17. How many protons does it have?
17 protons
The atomic mass of carbon is about 12. How many protons and neutrons does a common carbon atom have?
Carbon-12: 6 protons and 6 neutrons.
In 2C₆H₁₂O₆ (glucose) how many atoms are present
What is 48
The common name for the element with symbol K
What is Potassium
The symbol for the element with atomic number 7
Which has a greater atomic number: chlorine (Cl) or sulfur (S)?
Chlorine (Cl) has atomic number 17, sulfur (S) is 16 — chlorine has the greater atomic number.
If magnesium has an atomic number of 12, what would it's atomic mass be?
24-it has 12 protons and 12 neutrons
In 3Fe(NO₃)₂ (ferrous nitrate) how many atoms are present
What is 27
The full name of the element with atomic number 26
What is Iron
The element with the symbol Ag? (Give the element name.)
What is Silver
Element X has atomic number 12. Identify element X and tell how many protons and electrons it has as a neutral atom.
Atomic number 12 = magnesium (Mg); protons = 12, electrons = 12 (neutral atom).
If calcium has an atomic mass of 40.078, what would its number of protons be?
20 because that is also its atomic number
In 2Al(OH)₃ (aluminum hydroxide), how many atoms are present
What is 14
This element is named after the planet Mercury and its symbol is
Mercury → element name: Mercury, symbol Hg
This is the symbol for the element gold
Au
Two different elements have atomic numbers 20 and 21. Which one has more protons and how many more?
The element with atomic number 21 has more protons; it has one more proton than the element with atomic number 20.
If the atomic mass of vanadium is 50.9415, what would the number of protons be?
23 since that is its atomic number