Question

How many protons and how many neutrons are there in a nucleus of the most common isotope of (a) silicon, $$01428Si^{28}$$_{\phantom{0}14}Si; (b) rubidium, $$03785Rb^{85}$$_{\phantom{0}37}Rb; (c) thallium, $$081205Tl^{205}$$_{\phantom{0}81}Tl?

Accepted Answer

Step 1: Understand the notation used for isotopes. The isotope notation is typically written as A/Z Element, where A is the mass number (total number of protons and neutrons), Z is the atomic number (number of protons), and 'Element' is the chemical symbol. For example, $$01428Si^{28}$$_{14}Si represents silicon with a mass number of 28 and an atomic number of 14. Step 2: Determine the number of protons in the nucleus. The atomic number (Z) directly gives the number of protons in the nucleus. For (a) silicon, Z = 14, so there are 14 protons. For (b) rubidium, Z = 37, so there are 37 protons. For (c) thallium, Z = 81, so there are 81 protons. Step 3: Calculate the number of neutrons in the nucleus. The number of neutrons is given by subtracting the atomic number (Z) from the mass number (A). Use the formula: n=A-Z. For (a) silicon, n = 28 - 14 = 14 neutrons. For (b) rubidium, n = 85 - 37 = 48 neutrons. For (c) thallium, n = 205 - 81 = 124 neutrons. Step 4: Summarize the findings for each isotope. For (a) silicon, the nucleus contains 14 protons and 14 neutrons. For (b) rubidium, the nucleus contains 37 protons and 48 neutrons. For (c) thallium, the nucleus contains 81 protons and 124 neutrons. Step 5: Verify the calculations and ensure the understanding of isotope notation. Double-check the subtraction for neutrons and confirm the atomic numbers using a periodic table to ensure accuracy.

How many protons and how many neutrons are there in a nucleus of the most common isotope of (a) silicon, $sub 14 to the 28th power S i$ ; (b) rubidium, $sub 37 to the 85th power R b$ ; (c) thallium, $sub 81 to the 205th power T l$ ?

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Concetti chiave

Atomic Structure

Isotopes

Nuclear Notation

How many protons and how many neutrons are there in a nucleus of the most common isotope of (a) silicon, 01428Si^{28}_{\(\phantom{0}\)14}Si; (b) rubidium, 03785Rb^{85}_{\(\phantom{0}\)37}Rb; (c) thallium, 081205Tl^{205}_{\(\phantom{0}\)81}Tl?

Risposta video verificata per un problema simile:

Concetti chiave

Atomic Structure

Isotopes

Nuclear Notation

How many protons and how many neutrons are there in a nucleus of the most common isotope of (a) silicon, $sub 14 to the 28th power S i$ ; (b) rubidium, $sub 37 to the 85th power R b$ ; (c) thallium, $sub 81 to the 205th power T l$ ?