The element with atomic number 35 belongs to which block?

Explanation

To determine which block the element with atomic number 35 belongs to, we will follow these steps:

### Step 1: Identify the Element
The element with atomic number 35 is Bromine (Br).

### Step 2: Write the Electronic Configuration
To find the block of the element, we need to write its electronic configuration. The atomic number 35 means that Bromine has 35 electrons. The electronic configuration can be derived as follows:
- The first 18 electrons fill up to Argon (Ar), which is the noble gas preceding Bromine.
- After Argon, the next electrons fill the 3d and 4s subshells before filling the 4p subshell.

So, the electronic configuration of Bromine (Br) is:
\[ \text{Br: } [\text{Ar}] \, 3d^{10} \, 4s^2 \, 4p^5 \]

### Step 3: Determine the Last Electron's Subshell
In the electronic configuration, the last electron enters the 4p subshell.

### Step 4: Identify the Block
Elements are categorized into blocks based on the subshell that contains the last electron:
- s-block: Last electron in s subshell
- p-block: Last electron in p subshell
- d-block: Last electron in d subshell
- f-block: Last electron in f subshell

Since the last electron of Bromine enters the p subshell, we conclude that Bromine is a p-block element.

### Final Answer
The element with atomic number 35 (Bromine) belongs to the **p-block**.

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