14. complete the claims and evidence grid to answer the following question: how many valence electrons does…
14. complete the claims and evidence grid to answer the following question: how many valence electrons does an atom of iron have? 15. complete the claims and evidence grid to answer the following question: how many energy levels does an atom of sodium have? 16. complete the claims and evidence grid to answer the following question: which elements atom is larger, hydrogen or radon?
Answer
14.
Explanation:
Step1: Recall iron's electron - configuration
Iron (Fe) has an atomic number of 26. Its electron - configuration is [Ar] 3d⁶4s².
Step2: Identify valence electrons
The outermost electrons are in the 4s and 3d orbitals. The 4s electrons are outer - most in terms of principal quantum number, and the 3d electrons also participate in chemical bonding. So, the number of valence electrons is 2 (from 4s) + 6 (from 3d) = 8.
Answer:
8
15.
Explanation:
Step1: Recall sodium's electron - configuration
Sodium (Na) has an atomic number of 11. Its electron - configuration is 1s²2s²2p⁶3s¹.
Step2: Count energy levels
The principal quantum numbers (n) represent energy levels. Here, n = 1, n = 2, and n = 3 are occupied. So, the number of energy levels is 3.
Answer:
3
16.
Explanation:
Step1: Recall atomic size trends
Atomic size increases down a group in the periodic table due to the addition of new energy levels.
Step2: Locate hydrogen and radon
Hydrogen is in the first period and first group, while radon is in the sixth period and 18th group. Radon has more energy levels than hydrogen.
Answer:
Radon