Question

A) Which property do the elements in each column of the representative elements series of the
periodic table have in common? (1 point)
number of protons
number of valence electrons
number of neutrons
number of orbitals
Answer
Which element has six valence electrons?
(1 point)
phosphorus (P)
lead (Pb)
oxygen (O)
carbon (C)
Answer
A) Which of the following defines the atomic number of an atom? (1 point)
the number of protons
the number of valence electrons
the number of electrons, protons, and neutrons
the number of neutrons
Answer
A) Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many
neutrons does potassium have? (1 point)
20
19
39
58
Answer
A) Which element does not have the same number of electrons in its outermost shell as the
other elements in its group? (1 point)
bromine (Br)
boron (B)
hydrogen (H)
helium (He)
Answered by GPT-4o mini
The elements in each column (group) of the representative elements series of the periodic table have in common the **number of valence electrons**. Each group contains elements that have the same number of electrons in their outermost shell, which determines their chemical properties and reactivity.
Answered by GPT-4o mini
The element that has six valence electrons is **oxygen (O)**. Oxygen is in Group 16 of the periodic table, which is known as the chalcogen group and has six valence electrons in its outermost shell.
Answered by GPT-4o mini
The atomic number of an atom is defined as **the number of protons**. The atomic number determines the identity of the element and its position in the periodic table.
Answered by GPT-4o mini
To find the number of neutrons in an atom, you can use the formula:

\[
\text{Number of neutrons} = \text{Atomic mass} - \text{Atomic number}
\]

For potassium (K):
- Atomic number = 19 (number of protons)
- Atomic mass = approximately 39

Using the formula:

\[
\text{Number of neutrons} = 39 - 19 = 20
\]

So, potassium has **20 neutrons**.
Answered by GPT-4o mini
In the given options, **hydrogen (H)** does not have the same number of electrons in its outermost shell as the other elements in its group.

- **Boron (B)** is in Group 13 and has 3 valence electrons.
- **Helium (He)** is in Group 18 and has 2 valence electrons.
- **Bromine (Br)** is in Group 17 and has 7 valence electrons.

Hydrogen, on the other hand, has only 1 electron in its outermost shell, which is different from the others.