Don’t create several items about the same thing on the same page.
You can use the itemref
attribute to add properties to an item that are not nested in the same element:
<div id="header" itemscope itemtype="http://schema.org/Organization" itemref="address">
<h1 itemprop="name">Webshopname</h1>
<img id="logo" itemprop="logo" src="https://webshopurl/img/webshop-logo.png">
</div>
<div class="whole_article" itemscope itemtype="http://schema.org/Product">
<h1 itemprop="name">Articlename</h1>
</div>
<div id="footer">
<div id="address" itemprop="address" itemscope itemtype="http://schema.org/PostalAddress">
<div itemprop="streetAddress">Address 12</div>
<div itemprop="postalCode">Postalcode</div>
<div itemprop="addressLocality">Locality</div>
</div>
</div>