"main group element" meaning in English

{
  "forms": [
    {
      "form": "main group elements",
      "tags": [
        "plural"
      ]
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      "expansion": "main group element (plural main group elements)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "English entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Inorganic chemistry",
          "orig": "en:Inorganic chemistry",
          "parents": [
            "Chemistry",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Types of chemical element",
          "orig": "en:Types of chemical element",
          "parents": [
            "Chemical elements",
            "Matter",
            "Chemistry",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Any chemical element from the main group."
      ],
      "id": "en-main_group_element-en-noun-GJOJT2vt",
      "links": [
        [
          "inorganic chemistry",
          "inorganic chemistry"
        ],
        [
          "physics",
          "physics"
        ],
        [
          "chemical",
          "chemical"
        ],
        [
          "main group",
          "main group"
        ]
      ],
      "raw_glosses": [
        "(inorganic chemistry, physics) Any chemical element from the main group."
      ],
      "topics": [
        "chemistry",
        "inorganic-chemistry",
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Any chemical element from the main group",
          "word": "pääryhmän alkuaine"
        }
      ],
      "wikipedia": [
        "main group element"
      ]
    }
  ],
  "word": "main group element"
}

{
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    {
      "form": "main group elements",
      "tags": [
        "plural"
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    }
  ],
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Inorganic chemistry",
        "en:Physics",
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      "glosses": [
        "Any chemical element from the main group."
      ],
      "links": [
        [
          "inorganic chemistry",
          "inorganic chemistry"
        ],
        [
          "physics",
          "physics"
        ],
        [
          "chemical",
          "chemical"
        ],
        [
          "main group",
          "main group"
        ]
      ],
      "raw_glosses": [
        "(inorganic chemistry, physics) Any chemical element from the main group."
      ],
      "topics": [
        "chemistry",
        "inorganic-chemistry",
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
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  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Any chemical element from the main group",
      "word": "pääryhmän alkuaine"
    }
  ],
  "word": "main group element"
}