Valence Electrons
There are 2 electrons in the first shell and 1 electron in the second shell. How many valence electrons does the atom have?
What is 1 valence electron?
In a Bohr model, where are the electrons located?
What are electron shells/energy levels around the nucleus?
Isotopes of the same element always have the same number of these particles.
What are protons?
In the isotopic notation ²⁴₁₂Mg, what does the number 24 represent?
What is the mass number?
Find oxygen on the periodic table. What is its chemical symbol?
What is O?
A Bohr model has 2 electrons in the first shell and 6 electrons in the second shell. How many valence electrons does it have?
What are 6 valence electrons?
A neutral lithium atom has 3 protons. How many electrons should appear in its Bohr model?
What are 3 electrons?
Isotopes of the same element have different numbers of these particles.
What are neutrons?
An isotope has 11 protons and 12 neutrons. What is its mass number?
What is 23?
Find sodium (Na) on the periodic table. What is its atomic number?
What is 11?
A model shows electrons arranged 2–8–2. How many valence electrons does this atom have?
What are 2 valence electrons?
An atom's Bohr model contains 2 electrons in the first shell and 4 in the second shell. How many total electrons are shown?
What are 6 electrons?
An atom has 6 protons and 8 neutrons. What is its mass number?
What is 14?
An atom is written as ²³₁₁Na. What is its atomic number?
What is 11?
An element has an atomic number of 12. Use the periodic table to identify the element.
What is magnesium (Mg)?
A model shows 2 electrons in the first shell, 8 in the second, and 7 in the third. Identify the number of valence electrons.
What are 7 valence electrons?
A neutral atom has 11 protons. How should its 11 electrons be arranged in a Bohr model? You can draw the model to show your answer
What is 2–8–1?
Carbon-12 and Carbon-14 are isotopes of the same element. Carbon-12 has 6 neutrons. How many neutrons does Carbon-14 have?
What are 8 neutrons?
An atom is written as ³⁷₁₇Cl. How many neutrons does this isotope contain?
What are 20 neutrons?
A neutral atom of aluminum has an atomic number of 13. How many protons and electrons does it have?
What are 13 protons and 13 electrons?
Atom A has an electron arrangement of 2–8–1. Atom B has an arrangement of 2–8–6. Which atom has more valence electrons, and how many more?
What is Atom B, with 5 more valence electrons?
A student draws a neutral oxygen atom with 8 protons but only 7 electrons. What needs to be corrected?
What is add one electron, because a neutral oxygen atom should have 8 electrons?
Atom A has 8 protons and 8 neutrons. Atom B has 8 protons and 10 neutrons. Explain why these atoms are isotopes of each other.
What is they have the same number of protons but different numbers of neutrons?
An isotope has 12 protons and 13 neutrons. Give its isotope name and nuclear notation.
What are Magnesium-25 and ²⁵₁₂Mg?
Use the periodic table to identify the element with atomic number 17. Then give its symbol and the number of protons in one atom.
What are chlorine, Cl, and 17 protons?