Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in.
The half-life of Th-232 is 1.405 × 10¹⁰ years
Time elapsed = 2.8 x 10⁹ years
Equation of radioactive decay:
A = A₀ = (1/2)^ t/t₁/₂
where A₀ is the initial amount, A is the amount after time t, t₁/₂ is the half file
The fraction of thorium-232 that remains in the rock after 2.8 billions years is,
A/A₀ = (1/2) ^ (2.8 x 10⁹/ 1.405 × 10¹⁰) = 0.871
Therefore, the percentage of thorium-232 in the rock that was dated at 2.8 billions year = 87.1%
Answer:
Protons and neutrons are located in the nucleus.
Explanation:
As the orbitals are called electron orbitals, that houses the electrons, which have a negative charge. Protons and neutrons are bonded in the nucleus. Protons have a positive charge while neutrons have a charge of 0. When finding the charge of an atom, you will consider the protons and the electrons, and when finding the atomic number of an element (the number on the periodic table) you will consider the protons, and when finding the atomic mass you will consider the protons and neutrons.